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SNIP – impact factor for journals from the Source Normalized Impact per Paper (1999 - 2020)

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Source Normalized Impact per Paper (SNIP) is a database published twice a year by the Leiden University's Centre for Science & Technology Studies (CWTS) in cooperation with Elsevier. It includes records with citation impact data (impact factor data) of scientific publications covered by the Scopus database from 1999 onwards.