Larivière V, Gingras Y. On the prevalence and scientific impact of duplicate publications in different scientific fields (1980-2007). Journal of Documentation 2010;66:179-90
Duplicate publications have received a lot of attention in medical literature but much less in the information science community. A bibliometric technique was developed by authors to detect duplicate papers across all fields of research, between 1980 and 2007, based on all the following metadata in common: exact same title, same first author, same number of cited references. The prevalence of duplicates is low, i.e. one out of 2,000 papers, and it is higher in the natural and medical sciences than in the social sciences and humanities. The scientific impact of duplicate papers is below average as they are generally published in journals with impact factors below the average of their field.