As citations to articles in fraudulent journals increasingly appear in article manuscripts, vexing reviewers and editors alike, the scholarly communications community needs to develop an automated shared service to assess works cited efficiently and ensure that authors are not inadvertently polluting the scholarly record.
The scale of the number of questionable publishers is startling (just thinking about 10,000 fraudulent publishers can be overwhelming). The HYDRA idea discussed in this Scholarly Kitchen piece has a lot going for it. We are planning a Research Ethics Monthly piece reflecting on the issues.
CrossRef is not the only organization to grapple with this issue. The Scientist reported in May on growing concerns among researchers about papers from fraudulent publishers finding their way into PubMed via PubMedCentral. Once in PubMed, the papers appear just like any other paper and can easily be found and cited by researchers.