title: Controversial impact factor gets a heavyweight rival.
authors.forename: Richard
authors.initials: R
authors.lastname: Van Noorden
mesh_terms: D016208:Databases, Factual; D055811:Journal Impact Factor; D010506:Periodicals as Topic / Q000592:standards* / Q000706:statistics & numerical data*; D011643:Publishing / Q000592:standards / Q000639:trends