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A broader, more-transparent suite of metrics will improve science publishing, urge Paul Wouters and colleagues, together with 18 co-signatories. ILLUSTRATION BY DAVID PARKINS3 0 M A Y 2 0 1 9 | V O L 5 6 9 | N A T U R E | 6 2 1 COMMENT © 2 0 1 9 S p r i n g e r N a t u r e L i m i t e d . A l l r i g h t s r e s e r v e d .

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All metrics published in the Journal Citation Reports™ are dependent on the complete and correct aggregation of citations to each journal title. Here, we explain how unique cited titles are created for Thomson Reuters indexing, and how variations and ambiguities in titles are collected in order to create the Journal Impact Factor numerator.

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