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Dealing with the grey zone of publishing or… how I will never be an editorial board member of MDPI Publications.

The “predatory publisher” category raises more questions than answers. Just like “academic fraud”, it tends to validate a black & white world in which rules and norms are clear-cut and universally shared through time, disciplines and countries. There is now an extensive literature presenting lists, criteria and even automatic detection for such publishers or their journals, most of it being written without questioning the label “predatory”1. More interestingly, there are a few papers describing the point of view of authors publishing in such vilified outputs, showing both the deceptions performed by the publisher and the good faith of most authors2.

Such results could be downplayed on the grounds of the authors’ peripheral position or the low power of the studies. On the opposite, everyday stories show that separating the wheat from the chaff is rather complex because a huge and diverse “grey zone” exists, even for scholars well versed in the arcane of publishing. This post aims to describe such an example by making the story personal rather than abstract, using testimonies, personal opinions and statements. In this world, the choice to review, write or edit for a given journal or publisher remains tricky, based on existing alternatives, personal ethics and situated decisions

It has become an almost daily ritual: an invitation to present at a conference, to submit a manuscript to a journal, or even to join an editorial committee, sent by people you don’t know, with a vague personalized message through your name and the reproduction of the title of an article you’ve written, with zero relevance to the issuing conference or journal. On August, 9th 2023, I received one of these messages, entitled: “[Publications] (ISSN 2304-6775) Invitation to Serve as an Editorial Board Member”. It caught my attention for three reasons: firstly, it’s that time of the year with the lowest e-mail volume; secondly, there was an apparent MDPI account in the copy of the mailing; and thirdly, I know this journal, some of its articles I found relevant or even enlightning, and others cite some of my work (which is not a sign of quality but could explain this invitation). So let’s read it again:

We would like to invite you to join the Editorial Board of Publications (ISSN 2304-6775, https://www.mdpi.com/journal/publications). Publications is open access and peer-reviewed, covering all aspects of scholarly publishing and communication. You can find the proposed scope of the journal here: https://www.mdpi.com/journal/publications/about/.
Publications is abstracted and indexed by Scopus, ESCI, DOAJ.

This presentation is not typical of « predatory » emails that begin by flattering the recipient of the message, emphasising the importance of their work and what they can contribute to the journal, and at the same time inviting them to join the editorial board and submit a manuscript.

Editorial Board Members will be responsible for final decisions on  manuscripts in their field of expertise and may be invited to review manuscripts. The initial term lasts for 2 years, and entails:
• Pre-screening and making decisions on new submissions related to your research interests;
• Providing input or feedback regarding journal policies;
• Helping to promote the journal among your peers or at conferences;
• Attending Board Meetings to suggest journal development strategies;
• Reviewing manuscripts.
• Helping to attract suitable expert authors.

The job description for editorial board members is typical of a journal owned by a commercial publisher: in a nutshell, you run the journal, you promote it without being the decision-maker on its policies and, obviously, without compensation except in what many colleagues name a prestige economy.3

If you accept our invitation, please provide your contact information and a list of keywords reflecting your expertise, in accordance with the entry examples at https://www.mdpi.com/journal/publications/editors/. If possible, please also send, for our records, a CV or an official website with your biographical data (including a list of your publications). If this is of interest, but comes at an inopportune time, you may have a recommendation for a senior expert to serve as an Editorial Board member. If you have any questions, suggestions or recommendations, please let us know.

This detailed procedure is another hint to add in the direction of a genuine invitation for a position in the committee of a standard commercial publisher journal, which is rarely considered as a “grey zone” output. Nevertheless, there is another surprising piece of information about the ‘benefits attached to the position of editorial board member. I don’t know if it is a standard practice in APC-based journals5. Yet this three-line paragraph looks extremely problematic to me for three cumulative reasons. Once again, others could consider it completely benign, due to shared ethics and practices, which would prevent everything that follows.

Additionally, you are welcome to publish with the journal—this will be free of charge once accepted for publication. The term for the Editorial Board membership lasts for two years and can be renewed.

This paragraph alone could have made me cringe and refuse the invitation. But it also comes from a publisher which is piling up 50 shades of grey stories.

At the end of the last century, a Chinese chemist woking in Switzerland invented a preservation practice: to deposit a sample of compounds associated with an article, and to do so confounded the la Molecular Diversity Preservation International (MDPI). He then created a journal, Molecules, published by Springer, taking the position of editor-in-chief and explained his aim:

Soon, the relationship with the publisher turned sour, and the chemist, Sun-Kun Lin, decided to add to MDPI operations the publication of a journal entitled… Molecules. Springer threatened to sue him claiming it owned the title but finally did not. The lone rebel quickly developed a successful business formula, sometimes labelled “low-cost full open access journals”. It was a striking example of the “new journals” that the open access activists pushed for in the BOAI. Later, MDPI was rebranded MultiDisciplinary Publishing Initiative, became one of the top 5 academic publishers as far as volume is concerned, with most journal titles being as generic as possible from Acoustics to Youth, passing by Genes, Physics, Societies and Software. So, the initial declaration of indépendance made by one academic grew into a worldwide success story, but went along with dubious reputation and negative narratives.

Let’s give a few examples of these stories. A neurosurgeon received a request for an assessment from the Journal of Clinical Medicine and responded with a very negative assessment within 2 days. In his view, there were major methodological problems preventing publication, in particular discrepancies between the protocol described and the reality of the clinical trial. Two days after sending his review, he received a request for the revised article. This new manuscript was very different from the first:

Despite these problems, two other reviewers accepted the manuscript, while another colleague agreed to reject it, ‘forcing’ the editor-in-chief to refuse publication. But the story doesn’t end there, because the same manuscript reappeared in another MDPI journal, Geriatrics… in a version very similar to the first manuscript submitted. The reviewer contacted the editor-in-chief, shared his experience and the manuscript was ‘withdrawn’ in agreement with the authors. But like a B-movie with undead enemies who never disappear, the manuscript was eventually published in a third MDPI journal, Medicina. This story is typical of the grey zone: authors willing to do anything to get published, complacent reviewers, a system of manuscript transfer to ‘optimise’ publication, but also honest reviewers and editors willing to listen even when they want to reject.

Let’s turn now to the employees of MDPI, those who maintain the supply chain publication. In Bucharest, a young employee died of a heart attack on MDPI’s premises, and the local media questioned the employer’s responsibility in dealing with the health emergency and, more broadly, working conditions. As in other capital-intensive production facilities, journal editors are partly judged and rewarded on the basis of quantitative indicators. Not only does the APC-based model generate income only if the manuscript is accepted, but the workers are directly incentivised by this ‘success’:

This production culture, which combines speed and pressure, is felt by both editors and reviewers. It is always in this form of experience and testimony that colleagues react, in a ‘me too’ frame. This often leads them to break off all relations with the publisher, its journals and its editors, despite frequent reminders by e-mail:

Responses to the Neurosurgeon reviewer story on Blue Sky https://bsky.app/profile/supersciencegrl.co.uk/post/3l2kapfizr626

These experiences happen within the frame of “normal” journals, but there is an elephant in the room: MDPI developed/invented the concept of multiple special issues happening at the same time for any given journal. As a social scientist, I normally enjoy special issues on my topics of interest and cherish a well-crafted collection of papers which, ideally, discuss with one another. For example “Women in Chemistry Science” seems like a very interesting topic for the already cited Molecules. But MDPI twisted this nice idea making the traditional “special issue” another grey object.

I said at the beginning of this post that I would give priority to a situated view, to experience rather than objective data. But for those of you who don’t know, here were the figures for MDPI on the importance of special issues:

Source: https://paolocrosetto.wordpress.com/wp-content/uploads/2021/04/overall_articles_si_waffle.png

This figure is extracted from a very informative blog post by Paolo Crosetto, written almost 4 years ago, and entitled “Is MDPI a predatory publisher?” in which the author answers “yes and no”.

That very fine post was heavily commented on the data, its interpretation, showing very contrasted views to answer on the nature of MDPI publishing. Furthermore, by the end of 2021, the number of special issues had exploded, with some journals publishing more than one a day. On the producer side, we now know that the special issue system has a similar “point system” that pushes MDPI employees to publish more. But how do we explain this success on authors side? In my opinion, it is a perfect combination of what at first sight might not seem to be so: the close relationships of small groups of colleagues sharing peculiar interests and a large-scale industrial production model. Again, let’s be concrete and talk about my own experience. After not responding to the invitation to join the editorial board, I received an invitation 14 months later to manage a special issue:

Dear Dr. Torny,

This is Mike Tang, Section Managing Editor of Publications.
We are planning to launch a new Special Issue, "Preprint and Open-Access Publishing", in the journal Publications, and we would like to invite you to act as the Guest Editor for this issue.

Wouah ! Preprint and OA publishing, exactly the topics I am interested in. I would easily find 10 colleagues in different countries who would provide very interesting and innovative contributions from diverse perspectives. Sure, I would also suggest expert reviewers, find 10 APCs in grants, manage the whole process and be proud of the results. All for free: I forgot to tell you, there is no financial incentive in getting the job done, no APC waiver,, except fulfilling your dreams as a knowledge creator and disseminator. And all the benefits of such a special issue, as well as your duties are being described in depth by the publisher. Despite being emailed with the exact same message3 more times, I did not answer.

After my narration I could state, with other colleagues that some elements of MDPI business models and practices are unpleasant, incentivize problematic publications or that its special issue model is deeply fraught at scale. That is a personal opinion based on empirical matter, it does not make enough to stand in an academic article. Especially as the “predatory” label has led to strong responses from publishers, as it has been seen again in the MDPI case. In July 2021, an article was published on the question of predatory publishing definition , taking the empirical example of MDPI journals. Its conclusion could be summed up like this::”The formal criteria together with the analysis of the citation patterns of the 53 journals under analysis all singled them out as predatory journals. 

Its fate illustrates the consequences of a black-and-white representation and the difficulties to qualify the ‘grey zone’ in academic discourse. In fact, less than a month later, MDPI responded point by point to this article on its website11. Above and beyond the refutation of some empirical data, MDPI would point out the problems to define the predatory category thus invalidating the overall conclusion of the author.. For example, they discussion the number of editorial board members:

MDPI also insists in several occurrences that it is not unique among publishers, or at least among commercial publishers. It even acknowledges the possibility of predatory publishing… naturally into other publishing houses!

So the author made a paper claiming a lot of MDPI journals were predatory, the publisher responded in a very civil academic way. What happens next ? One month later, Research Evaluation/OUP published an Expression of concern without detail, then retracted the article and published simultaneously a new version, redacted by them and the author. Beyond the fact that such a process is rare – you would expect a simple correction, has MDPI played a role in the process ? Was there pressure? How dit the author feel? As often, we have to turn to Retraction Watch to have all the details, with interviews of the author and MDPI12. We will focus here on MDPI position:

So not only MDPI claims to have been left in the dark, but ironically considers that the largest university press (and one of the oldest) does not follow best practices. Their call was heard as a PDF was published a month later as supplementary data, depicting all the changes between the original and the revised version. Let’s simply take the following two exemples:

In both cases, the author has kept her general argumentation, but she has abandoned her objective language in favor of verbal modalisations that leave room for subjectivity: we may think that these journals are predatory, but we no longer assert, without any possible discussion, that they are classified as such. In other words, we’re back in the grey zone where it’s up to everyone (authors, reviewers, publishers, institutions) to decide what they want to do.

And this is where we go back to our starting point. Why did I receive that invitation to join Publications editorial board in the first place? Because the vast majority of the editorial board of Publications had resigned a few months earlier, relatively discreetly. The most immediately visible trace came from its former editor in chief, Gemma E Derrick, which started the exit movement.

Source: https://x.com/GemmaDerrick/status/1636719479441727488

Her justification is typically framed as a ‘grey area’ one : it is not possible to articulate good editorial practices in her specific scientific collective with the multiplication of stories about the problematic practices of MDPI, the owner and publisher of the title. The subsequent resignations are reported by a Norwegian newspaper13. In addition to the reasons given above, it is also the case that this particular journal deals with publications that need to be brought even more into line with current publishing standards. I was already aware of the resignations when I received the first MDPI email, and that was an additional reason for me not to accept the invitatio, as it would belittle the move from colleagues whom I hold in high esteem, and not to show the solidarity they have thus expressed.

Unlike other cases of mass resignation from journals, Publications editorial board members didi not directly criticize MDPI, because they target the publisher’s general policies rather than their specific treatment. Their resignation reminds us that we can decide, in each of our micro-acts, in which scholarly communication world we want to live . Let’s take a final MDPI example: one journal had really become their flagship, International Journal of Environmental Research and Public Health (IJERPH). In fact, its growth seemed limitless, notably through the special issue format, to reach the incredible number of 16,889 articles published in 2022. And then, in April 2023, Clarivate announced the delisting of more than 50 journals, notably many Hindawi journals, but also MDPI IJERPH. What were the consequences? MDPI’s PR stated that still 90% of its content was listed by Web of Science. But authors fled in flocks as soon as the announcement was made, even before the journal was going to effectively lose its Journal Impact Factor.


Source: https://scholarlykitchen.sspnet.orgwp-content/uploads/2023/09/Figure-1-1024×530.png

This trend has been confirmed in 2024, with the total number of IJERPH articles making less than 10% of its peak in 2022, raising the question of authors’ responsibility. All it takes is Clarivate’s ‘quality signal’ to disappear for them to turn their backs on a journal in which they used to publish en masse. This is the magic of the grey zone, where one can venture without any real consequences. Playing with the rules, bending practices, encouraging mass production – these are not specific to MDPI, but to varying degrees are shared by all commercial publishers, with authors complying and most often editorial teams. And it is probable that their megajournals like Elsevier’s Heliyon and Springer’s Cureus will meet a similar fate.

  1. On the geopolitical consequences of that position, see Taşkın, Zehra, Franciszek Krawczyk, and Emanuel Kulczycki. “Are papers published in predatory journals worthless? A geopolitical dimension revealed by content-based analysis of citations.” Quantitative Science Studies 4.1 (2023): 44-67, https://doi.org/10.1162/qss_a_00242 []
  2. Boukacem-Zeghmouri, Chérifa, Lucas Pergola, and Hugo Castaneda. “Profiles, motives and experiences of authors publishing in predatory journals: OMICS as a case study.” (2023) []
  3. For example, Tennant, Jonathan P., et al. “Ten hot topics around scholarly publishing.” Publications 7.2 (2019): 34.https://doi.org/10.3390/publications7020034 []
  4. This is a theoretical division, actual tasks performed are another story see on the Diamond journals case, Dufour, Quentin, David Pontille, and Didier Torny. “Supporting Diamond Open Access journals.” Nordic Journal of Library and Information Studies 4.2 (2023): 35-55., 10.7146/njlis.v4i2.140344 []
  5. To my knowledge there is no data on these policies towards editors, except on the question of paid editorial board members, especially in biomedicine []
  6. Teixeira da Silva, Jaime A. “The Conceptual ‘APC Ring’: Is There a Risk of APC-Driven Guest Authorship, and Is a Change in the Culture of the APC Needed?.” Journal of Scholarly Publishing 55.3 (2024): 404-425.https://doi.org/10.3138/jsp-2023-0060 []
  7. Lin, SK. Editorial: A Good Yield and a High Standard. Molecules 1, 1–2 (1996). https://doi.org/10.1007/s00783005000). []
  8. Rene Aquarius, “My reviewer experience at MDPI”, August 2024, https://deevybee.blogspot.com/2024/08/guest-post-my-experience-as-reviewer.html []
  9. Young employee’s death puts workplace culture in spotlight at publisher MDPI, Retractionwatch, 22nd October 2024 []
  10. Paolo Crosetto, “Is MDPI a predatory publisher?”, 12 April 2021 []
  11. MDPI: Comment on: ‘Journal citation reports and the definition of a predatory journal: The case of the Multidisciplinary Digital Publishing Institute (MDPI)’ from Oviedo-García, []
  12. .Article that assessed MDPI journals as “predatory” retracted and replaced, Retraction Watch, 8 May 2023. Once again, it has become a very commented post []
  13. https://www.khrono.no/truer-med-a-flykte-fra-tidsskrift-etter-at-redaktoren-ble-kastet/794389 []

The sustainability argument or… How academic journals economic models never really last

The starting point for this post is an article from Scholarly Kitchen in which, once again, the sustainability of Diamond journals and here the Subscribe to Open model, is questioned. This leads the author, Rick Anderson, to define sustainability:

“It’s a concept that gets invoked in many different contexts to mean a range of different things, but in this context its meaning is both basic and simple: a publisher’s business model is sustainable if it’s able to be sustained over time. […] What determines sustainability? For an ongoing and open-ended project like publishing, the baseline determinant of sustainability is simple: recurring, reliable revenue.”

This definition is interesting, though it stands on a muddy ground: how do we define “recurring reliable revenue”? What is the timeframe to judge reliability? My post will argue that there is no such thing as a stable business model, at least for a long time. Moreover, if Anderson is right to question the S20 future, the same questions should be asked to much-lightly considered “stable models”, starting with subscriptions.

Our present is not the continuation of the past: the short history of subscriptions

Over the three and a half centuries of scientific publication in journals, the economic relations between publishers of scientific outputs and their readers were far from stable. It was probably not until after the Second World War that the main relationships became those between publishers and academic libraries, on a national or international scale, not as part of a gift or exchange economy, but rather as a commodity.

As the number and budget of libraries increased and the number of published journals grew fast, a short golden age of subscriptions for journal producers, and notably commercial ones, began1. But by the 1970s, as budgets stagnated, harsh competition for libraries money was the first signal of what was later referred to as the serial crisis. This decades-long relationship, based on the sale of subscriptions and paper issues for each journal, has been profoundly transformed by the digitalization of journals.

In the late 1990s, three major events took place in the contractual relationship between libraries and scientific publishers. Firstly, in a relatively short period of time after the inception of the World Wide Web, the largest publishers put online not only their entire contemporary catalogue, but also part of their archival material. Secondly, publishers have been offering access to packages or bundles, not on a title-by-title basis, but to a long list or even all of their journals. Thirdly, to make this offer attractive, they favoured the emergence of library consortia which, by adding their singular needs, could constitute clients interested in this new plethoric offer. The combination of these three events gave rise to a new form of standard economic agreement, the big deal2.

As a result, the subscription business model has been changed from an audience-centered model – libraries purchase what readers want, title by title – to a model centered on the size of the publisher – libraries buy the most extensive offerings, leading to a much stronger oligopolization through buyouts of publishers and change of publishers for scholarly societies, very visible twenty years later.

Percentage of papers published by the five major publishers, by discipline in the Natural and Medical Sciences, 1973–2013.3

For most publishers – including self-publishing learned societies – subscription has only been profitable for a short time and is not anymore. It is not sustainable, since it now implies the disappearance of their autonomy or at least dependence on increasingly powerful players, likely to act unilaterally on their revenues. And even for the largest publishers, the threat of non-renewal of Big Deals is growing stronger from 2010 onwards, whether through the sudden drop in financial resources (Greece) or through the choice to no longer pay for a service that does not meet the needs of libraries (United States) or open access demands (Germany, Sweden). It is in this context that Elsevier has started to brand itslef as a data company, while new publishers are trying to make a new model last, based on Article Processing Charges.

The future will not be similar to nowdays: charging authors to the breakdown point

Charging authors is not a recent business model, there have been many examples of vanity publishing, targeted towards academia or outside of it4. In the US, from the 1930s on , an alternative funding model had already thrived, as subscription revenues were considered too low. It targeted authors and their funders, was based on per-page charges, first in Physics, then in other STM disciplines.5 But it was with electronification that the idea of paying a lump sum for authors – as opposed to a multitude of varying services (colour charges, page charges, cover charges…) emerged, soon to be known as Article Processing Charges (APC). Some new publishers have entirely adopted this new model, sooner or later being bought by legacy Big Publishers, like BMC by Springer or Hindawi by Wiley. But other ones have quickly become themselves global Big Publishers.

Retrospective statistics of the leading academic publishers in 20216

On selected Clarivate sources7, MDPI and Frontiers are now in the top 6 in volume published while added, they were making less than a fifth of ACS, Sage or OUP a decade ago! From the point of view of these new big players, APCs are so sustainable that they create journals almost every week. For example, in 2021 MDPI launched 84 new journals and only acquired two existing titles. As Dan Brockington has shown in his comprehensive analysis of MDPI data, this growth also comes from the lowering of rejection rates:

“Now, some 45% of the MDPI journals I analysed, have rejection rates of below 40% (Table 2). Papers in these journals account for nearly 38% of revenues from publication fees (Table 3). Conversely, the journals with rejection rates of over 50% account for just over 25% of revenues. Measures of esteem, such as listing in the Web of Science, did not seem to make a difference to rejection rates. Average rejection rate for WoS listed journals was 42.7%, and for unlisted journals 41.6%.”8

The incentive for publishers to accept a manuscript in the APC model has been discussed for a decade, and its link to the growth of vanity presses now dubbed “predatory publishers” is well established. Above and beyond what is often portrayed as a potential threat to the whole scholarly communication system, the APC business model is not sustainable from the authors and research organizations’ point of view. A large literature has constantly shown the rise of APC prices through time, would it be for open access journals or for those relying on the hybrid model. Whether they would name it “prestige prices” or “market power”, researchers describe an ever-growing number of APC articles and a rise in individual prices.9

Proponents of market regulation will argue that each author will adjust his or her willingness-to-pay to the audience and the supposed quality of the journal, but instead we see the exclusion of authors for lack of funds or the sale of places in the byline to pay APCs. And of course, the quasi-absence of success for such a business model in underfunded disciplines, like most of HSS ones.

Sustainable for whom? The durability of Diamond journals

The two most visible business models for disseminating journal content are therefore both not only at the mercy of default by their funders, but are unsustainable for both readers and authors and their respective institutions. The fact that they constitute today’s largest expenditure items in scholarly communication should not be taken as evidence of sustainability through the capture of recurrent reliable revenue. In research worlds subject to severe budgetary constraints and increasing visibility of expenditure lines, they are in fact the most threatened in their foundation.

That being said, what are the alternatives? They are well known, and have been running in some corners of the global journal market for decades without any structural sustainability problems, despite being underfunded. Their landscape has been described in a comprehensive study, showing small-scale non-profit community-owned arhcipelagoes10. Far from APC-based megajournals and publishers with huge portfolios, this ecosystem is sustained by learned societies, universities, research organizations, some research funders, but also large-scale technical infrastructures, the most obvious being PKP’s Open Journal Systems.

While it is certain that more funding and more support from different institutions is needed11, thousands of journals – and dozen of dissemination platforms – have shown their reliability as they passed the test of time.

Yet, most don’t pass the “Anderson sustainability test” as they don’t rely on “revenue” but rather support and funding as they have not been comodified. Moreover, the support come from the exact same sources that pay, in a way or another, the “unsustainable publishing models” described above. So, they are obviously sustainable for authors and for readers, but also for these supporting institutions. Though they don’t have a unified business model12 -Subscribe to Open being the latest & adequate to already commidified journals, they seem to thrive, each of them at their low-scale, but with an agregated population still larger than APC journals. After almost three decades of existence, resisting to several “serial crises”, haven’t they earn the right not to be questionned on their sutainibility, but rather considered as one of the most secure ways to build a sustanaible scholarly communication system, allied with institutional archives?

  1. Fyfe, Aileen. “From philanthropy to business: the economics of Royal Society journal publishing in the twentieth century.” Notes and Records (2022). Aileen Fyfe, Noah Moxham, Julie McDougall-Waters, and Camilla Mørk Røstvik , A History of Scientific Journals Publishing at the Royal Society, 1665-2015, UCL Press, 2022, chapter 14 []
  2. Frazier, Kenneth. “What’s the big deal?” The serials librarian 48.1-2 (2005): 49-59. []
  3. Larivière V, Haustein S, Mongeon P (2015) The Oligopoly of Academic Publishers in the Digital Era. PLoS ONE 10(6): e0127502. https://doi.org/10.1371/journal.pone.0127502 []
  4. see for a detailed history on books, Timothy Laquintano, The Legacy of the Vanity Press and Digital Transitions, Volume 16, Issue 1, Summer 2013, https://doi.org/10.3998/3336451.0016.104 []
  5. On the American Chemical Society example, see Noel, M. (2020). Back to disciplines: exploring the stability of publication regimes in chemistry: the case of the Journal of the American Chemical Society (1879–2010). Humanities and Social Sciences Communications, 7(1), 1-13; on the APS/AIP example, see Scheiding, T. (2009). Paying for knowledge one page at a time: The author fee in physics in twentieth-century America. Historical Studies in the Natural Sciences, 39(2), 219-247. []
  6. from Understanding the increasing market share of the academic publisher “Multidisciplinary Digital Publishing Institute”Dan Brockington in the publication output of Central and Eastern European countries: a case study of Hungary []
  7. That is much more restricted than Crossref, so more favourable to legacy publishers []
  8. Dan Brockington,MDPI Journals: 2015 -2021, 10 November 2022, https://danbrockington.com/2022/11/10/mdpi-journals-2015-2021/ []
  9. see for example, Budzinski, O., Grebel, T., Wolling, J. et al. Drivers of article processing charges in open access. Scientometrics 124, 2185–2206 (2020). https://doi.org/10.1007/s11192-020-03578-3 []
  10. Bosman, Jeroen, Jan Erik Frantsvåg, Bianca Kramer, Pierre-Carl Langlais, and Vanessa Proudman. “The OA diamond journals study. Part 1: Findings.” (2021) 10.5281/zenodo.4558704 []
  11. see recommandations from the mentioned study, Becerril, Arianna, Lars Bjørnshauge, Jeroen Bosman, Jan Erik Frantsvåg, Bianca Kramer, Pierre-Carl Langlais, Pierre Mounier, Vanessa Proudman, Claire Redhead, and Didier Torny. “The OA Diamond Journals Study. Part 2: Recommendations.” (2021), https://doi.org/10.5281/zenodo.4562790 []
  12. This diversity should be studied, as we will do it in the current European-funded Diamas project []