The journal impact factor denominator: defining citable (counted) items.

@article{McVeigh2009TheJI,
  title={The journal impact factor denominator: defining citable (counted) items.},
  author={Marie E. McVeigh and S. J. Mann},
  journal={JAMA},
  year={2009},
  volume={302 10},
  pages={
          1107-9
        }
}
OVER ITS 30-YEAR HISTORY, THE JOURNAL IMPACT factor has been the subject of much discussion and debate. From its first release in 1975, bibliometricians and library scientists discussed its value and its vagaries. In the last decade, discussion has shifted to the way in which impact factor data are used. In an environment eager for objective measures of productivity, relevance, and research value, the impact factor has been applied broadly and indiscriminately. The impact factor has gone from… Expand
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