Coordinated citation manipulation is artificially inflating the impact metrics of journals in molecular oncology, according to an analysis led by Adrian Barnett, a statistician at the Queensland University of Technology in Brisbane, Australia. By creating networks of suspicious papers that cite one another, paper mills are effectively gaming the system used by academic institutions to determine research funding and career advancement.
How Paper Mills Manipulate Citation Metrics
Researchers have identified a systematic pattern where paper mills sell studies that include built-in citations to other papers produced by the same entities. According to Barnett, “When a dishonest researcher buys a paper mill product, they not only get a published paper, but also get citations to that paper as part of the bargain.”
This practice creates a feedback loop that artificially boosts a journal’s impact factor. In some instances, the scale of this manipulation is significant. For example, in the Molecular Cancer and the Journal of Experimental & Clinical Cancer Research, both published by the BMC portfolio, which is owned by Springer Nature, flagged papers accounted for 57% of the citations that they received.
In many nations, having papers published in journals with high impact factors is taken into account when researchers apply for jobs and funding.
There has been a long-standing assumption in the academic community that studies produced by paper mills are only being published in journals with low impact metrics. However, the research led by Barnett suggests that this is not the case. René Aquarius, a neurosurgery researcher at Radboud University Medical Center in Nijmegen, the Netherlands, notes that while integrity sleuths have long suspected this activity, the new analysis provides an “elegant” confirmation of the scope of the problem.
Adam Day, founder of the research-integrity firm Clear Skies in London, emphasizes that identifying patterns of inflated citation counts is essential for spotting journals at risk. While tools like BERT are used to flag suspicious content, researchers acknowledge the risk of false positives. Barnett notes that while his team’s flagged list of 4,085 papers likely contains some genuine studies, the sheer volume of the data confirms a broader pattern of systemic manipulation rather than isolated incidents.
What Actions Are Publishers Taking?
The discovery of these citation rings has prompted responses from major publishing houses. Selene Carey, the publishing director for BMC journals, stated that she and her team are reviewing the findings from the preprint and intend to take action where appropriate.
Detecting these networks remains a technical challenge. While automated tools help, the goal is to identify probable suspects rather than definitively determine whether a paper is genuine or not.
When evaluating a journal’s credibility, look beyond the impact factor.
Frequently Asked Questions
What is a paper mill in academic publishing?
A paper mill is an organization that produces and sells research papers.
How do citation rings affect research quality?
These metrics measure of how often a journal’s papers are cited in other research, among other things.
Are all journals vulnerable to citation manipulation?
Barnett says that there is an assumption that studies produced by paper mills are only being published in journals with low impact metrics, but his team’s research suggest that this is not the case.
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