Source of journal impact factors and subject category rankings for journals indexed in the Web of Science database.
Definition: The impact factor of Journal A = number of citations to articles in Journal A in Web of Science in previous two years, divided by number of original research articles and reviews published by Journal A in the previous two years.
Impact factors are calculated and published annually in the following resource:
Source of journal impact factors and subject category rankings for journals indexed in the Web of Science database.
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