Abstract(s)
The issue of duplicate publications has received a lot of attention in the medical literature, but much less in
the information science community. This paper aims at analyzing the prevalence and scientific impact of
duplicate publications across all fields of research between 1980 and 2007, using a definition of duplicate
papers based on their metadata. It shows that in all fields combined, the prevalence of duplicates is one out
of two-thousand papers, but is higher in the natural and medical sciences than in the social sciences and
humanities. A very high proportion (>85%) of these papers are published the same year or one year apart,
which suggest that most duplicate papers were submitted simultaneously. Furthermore, duplicate papers are
generally published in journals with impact factors below the average of their field and obtain a lower
number of citations. This paper provides clear evidence that the prevalence of duplicate papers is low and,
more importantly, that the scientific impact of such papers is below average.