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Caveats for the journal and field normalizations in the CWTS (“Leiden”) evaluations of research performance
Opthof, Tobias, (2010)
Scopus's source normalized impact per paper (SNIP) versus a journal impact factor based on fractional counting of citations
Leydesdorff, Loet, (2010)
Turning the tables on citation analysis one more time: Principles for comparing sets of documents
Leydesdorff, Loet, (2011)