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We investigate the similarities of pairs of articles which are co-cited atthe different co-citation levels of the journal, article, section, paragraph,sentence and bracket. Our results indicate that textual similarity,intellectual overlap (shared references), author overlap (shared authors),proximity in publication time all rise monotonically as the co-citation levelgets lower (from journal to bracket). While the main gain in similarity happenswhen moving from journal to article co-citation, all level changes entail anincrease in similarity, especially section to paragraph and paragraph tosentence/bracket levels. We compare results from four journals over the years2010-2015: Cell, the European Journal of Operational Research, Physics LettersB and Research Policy, with consistent general outcomes and some interestingdifferences. Our findings motivate the use of granular co-citation informationas defined by meaningful units of text, with implications for, among others,the elaboration of maps of science and the retrieval of scholarly literature.

The Closer the Better: Similarity of Publication Pairs at Different Co-Citation Levels