Abstract
Among existing theoretical models for the h‐index, Hirsch's original approach, the Egghe‐Rousseau model, and the Glanzel‐Schubert model are the three main representatives. Assuming a power‐law relation or Heaps' law between publications and citations a unified theoretical explanation for these three models is provided. It is shown that on the level of universities, the Glanzel‐Schubert model fits best. © 2011 Wiley Periodicals, Inc.
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