С. А. Дурнев Scientific co-authorship is a natural reflection of the scientific collaboration. Multiple foreign studies based on Web of Science and Scopus data show that there has been an increase in the number of co-authors of scientific publications in international journals in various scientific areas over the recent decades. Obviously, it is rather difficult to perform an analysis of co-authorship in Russian journals using Web of Science and Scopus data. This paper examines trends in the number of co-authors of Russian scientific journal articles in the following five thematic areas: chemistry, history, mathematics, medicine, and physics. The data source of our investigation is the national bibliographic database Russian Science Citation Index (RSCI). We show a steady increase in the average number of co-authors per publication and an increase in the proportion of co-authored articles for the period from 2000 to 2020, and we notice differences in different scientific areas.
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