by subject – Retraction Watch

A researcher’s unusually high h-index gives a window into an expansive citation network

With an h-index of 75, computer scientist Thippa Reddy Gadekallu ranks among the world’s most highly cited researchers. But the speed and means of his ascent to those lofty heights of scholarship has been as remarkable as the achievement itself.

In less than a decade, Gadekallu, a professor at Zhejiang A&F University in China, has managed to bootstrap himself from scientific obscurity by collaborating with colleagues around the world who cite each other’s work in ways that have raised questions. In some years, Gadekallu received more citations than Yoshua Bengio, a pioneer in artificial intelligence and the top-rated computer scientist on Google Scholar.

Earlier work uncovered a network of reviewers on papers Gadekallu edited who frequently suggested adding citations to his work. A closer look by Retraction Watch shows the impact of that strategy on Gadekallu’s h-index, and reveals additional possible collaborators in the network.

Critics of birdsong study fight to be named in Nature’s retraction

A zebra finch in New South Wales, Australia. *Source: JJ Harrison/Wikimedia Commons (CC BY-SA 4.0)*

Researchers who flagged methodological issues in a paper on birdsong a year and a half before Nature retracted it say they should be credited in the editorial notice. But the editors have refused, with one telling the critics the paper was retracted for unrelated reasons.

The March 2024 study at the center of the dispute looked at how sexual selection may drive song patterns in male zebra finches. Nature retracted the paper last month because two of the synthetic song pairs used in the study were found to be unreliable, according to the notice. All three authors agreed to the retraction.

Todd Roberts, the paper’s corresponding author, told Retraction Watch the critics now asking for credit “prompted us to check the synthetic song pairs used in our paper.” He said his team did not do the reliability analysis of the pairs until after publication.

Widely criticized keto diet study retracted

A 2025 paper claiming the keto diet does not promote the formation of arterial plaques has been retracted after widespread criticism of the study’s methods and claims. The journal found “the identified errors are too great to be corrected with a corrigendum,” according to the March 11 retraction notice.

In April 2025, JACC: Advances published the study, which looked at plaque build-up in 100 otherwise generally healthy people who had experienced an increase in their cholesterol levels while being on a keto diet. The study claimed scans performed one year apart by the company Cleerly showed the diet was not associated with the development of arterial plaques.

This finding went against what previous studies had found, and it led to what Wired called “a new war in the nutrition world.”

New rule in Peru restricts authors with retractions from getting special bonuses

Peru’s Ministry of Education headquarters in Lima.
*ANDINA/Editora Perú*

In an ongoing effort to combat scientific misconduct, Peru has passed new rules that bar research faculty at public universities there from receiving special bonuses if they’ve had one or more retractions in the last three years.

The conditions, published March 2, apply to faculty members at public universities who are eligible for special bonuses funded by the Ministry of Education. Peruvian researchers who participate in one or more research projects qualify for the monthly bonuses, which range from 2,616.50 to 4,434.91 Peruvian soles, or US$699.60 to $1,185.80, according to a summary in the new rules.

The restrictions come after a 2024 investigative commission in Peru identified significant scientific fraud by criminal networks involved in buying and selling academic research. Transactions by three presumed criminal networks amounted to 11.42 million soles, or roughly $3 million, between 2019 and 2023, according to the commission’s report.

Nine years after journalist raised concerns, BMJ Group journal retracts stent paper

A BMJ Group journal has retracted a paper nearly nine years after a journalist raised concerns about undisclosed conflicts of interest and the study’s details contradicting those of its trial registration. The researchers also excluded a patient’s death from the study, the retraction notice says.

The study, published in Open Heart in May 2017, described the results of a clinical trial that tested commercially available stents with microengineered grooves produced by Abbott Vascular.

But four months later, veteran cardiology journalist Larry Husten pointed out the clinical trial registration described a plan to employ two stents produced by a different device maker – Palmaz Scientific, a company that funded the work and was owned by one of the authors. He also wrote that records “indicate that one patient in the trial died as a result of pancreatitis. It seems unlikely that this was related to the stent but shouldn’t this information have been reported in the Open Heart paper?”

One in 277 PubMed-indexed papers in 2026 shows fabricated references, says analysis

*Figure from correspondence to* The Lancet by Maxim Topaz and colleagues.

Fabricated citations in the biomedical literature have increased 12-fold in two years, according to an audit of nearly 2.5 million papers published as a letter to The Lancet today.

The analysis of articles indexed in PubMed found that about one in 277 papers published in the first seven weeks of 2026 referenced a paper that didn’t exist. That was a jump from 2025’s rate of one in 458 and 2023’s one in 2,828. The researchers, led by Maxim Topaz of Columbia University’s Data Science Institute, used AI to “distinguish genuine fabrications from formatting discrepancies such as informally abbreviated titles.”

Topaz’s group located the sharpest increase in hallucinated references in mid-2024, which they note coincided with the rise of AI writing tools. The findings come as Nature reported last month that tens of thousands of publications from 2025 “might include invalid references generated by AI.” Retraction Watch has seen its fair share of reports of hallucinated citations generated by LLMs like ChatGPT.

Court orders historian to repay grant funding for “pattern of plagiarism” in books

A federal court has ordered a “romance philologist” to repay the Swiss National Science Foundation roughly $51,000 after the group found the author responsible for “massive” scientific misconduct in two grant-funded books.

Carla Rossi, scientific director of the Centro Scaligero degli Studi Danteschi in Verona, Italy, must repay the funding due to extensive plagiarism discovered in the texts, according to the decision by the Federal Administrative Court of Switzerland, released in January. Rossi also is barred from applying for grant funding from the foundation for five years, according to the ruling. Rossi is founder and director of Institut d’Estudis Filològics Dantescs i Digitals Avançats in Barcelona and also director of the Research Centre for European Philological Tradition (RECEPTIO) in Switzerland, which operates an academic press that has published Rossi’s works.

The Swiss body issued the funding ban in 2024 and ordered Rossi to repay grants for a total of three books after finding a pattern of plagiarism and lack of transparency during the grant application process, according to a summary in the court decision. Rossi took the foundation to court over the findings, arguing it reviewed incorrect versions of her books and suggesting other versions circulating on the Internet were altered or manipulated by third parties.

Black marks on published papers don’t change citation rates, new study finds

Among the data analyzed were mean monthly citations per article for 151 papers that were retracted or issued some other editorial notice, and for a set of control articles. The solid vertical lines are median time to the peak citation month, and the dashed line is median time to the editorial notice.
*H. Studd et al/medRxiv 2026*

Neither retractions, expressions of concern, nor other editorial notices seem to keep authors from continuing to cite problematic papers, according to a look at what happened to more than 170 articles by one author.

“After the public notification of integrity concerns about an article, it would be expected that other authors would no longer cite the article because it is unreliable,” write the authors of a new preprint. But that’s not what they found in a limited comparative study. Whether the study is generalizable has yet to be seen, says one other expert.

Four sleuths – the University of Aberdeen’s Hugo Studd and Alison Avenell and the University of Auckland’s Andrew Grey and Mark J. Bolland – charted citation data for 172 papers on clinical trials from Zatollah Asemi, a nutrition researcher at Kashan University of Medical Sciences in Iran, whose work has come under scrutiny.

45 editors resign from math journal, former EIC calls Elsevier publisher a ‘mini-dictator’

Forty-five of 48 members of the editorial board of the Journal of Approximation Theory resigned earlier this month for what they called Elsevier’s “concerning and potentially detrimental” decisions regarding the publication.

Paul Nevai, formerly a professor at The Ohio State University, was appointed editor-in-chief of JAT in 1990 and held the position for 35 years until December. That’s when he reached the end of his term and Elsevier informed him they’d be filling the position with someone else.

The mass resignation came after what Nevai said were several years of bad blood between the editors of the journal (including him) and the publisher, Giampiero Accardo. A representative for Elsevier told us designated publishers like Accardo are Elsevier employees who “oversee a portfolio of academic journals within a subject area, working closely with editors, authors, and research communities to support their development and long-term success.”

“Game-changer” breast cancer study retracted as Indiana researcher out of his post

A group of cancer researchers whose work has been questioned by sleuths has been hit with their third retraction in less than a year.

Today, Science Translational Medicine (STM) withdrew a 2021 breast cancer study by former Indiana University researcher Yujing Li and 12 other authors for image falsification. The immunotherapy study had been described by senior author Xiongbin Lu as a “game-changer” for triple negative breast cancer in a 2021 IU press release.

The paper’s April 15 retraction notice states that a joint research misconduct investigation involving Indiana University, The Ohio State University, and the University of Maryland, College Park determined “falsification occurred during creation of figure S9C.” The institutions alerted the American Association for the Advancement of Science of the misconduct late last year and requested the paper’s retraction, according to Meagan Phelan, a spokesperson for AAAS, which publishes STM.

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