Article impact calculated over arbitrary periods: Research Articles
Journal of the American Society for Information Science and Technology
The Hirsch index and related impact measures
Annual Review of Information Science and Technology
Journal of Information Science
The Hirsch index of a shifted Lotka function and its relation with the impact factor
Journal of the American Society for Information Science and Technology
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Using a power-law model, the two best-known topics in citation analysis, namely the impact factor and the Hirsch index, are unified into one relation (not a function). The validity of our model is, at least in a qualitative way, confirmed by real data. © 2009 Wiley Periodicals, Inc.