, Volume 69, Issue 1, pp 121–129

An informetric model for the Hirsch-index

  • Leo Egghe
  • Ronald Rousseau


The h-index (or Hirsch-index) was defined by Hirsch in 2005 as the number h such that, for a general group of papers, h papers received at least h citations while the other papers received no more than h citations. This definition is extended here to the general framework of Information Production Processes (IPPs), using a source-item terminology. It is further shown that in each practical situation an IPP always has a unique h-index. In Lotkaian systems h = T1/a, where T is the total number of sources and α is the Lotka exponent. The relation between h and the total number of items is highlighted.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag/Akadémiai Kiadó 2006

Authors and Affiliations

  • Leo Egghe
    • 1
  • Ronald Rousseau
    • 2
  1. 1.Hasselt University; Antwerp University, IBW
  2. 2.Department of Industrial Sciences and TechnologyAntwerp University, IBW; KHBO (Association K.U.Leuven), Industrial Sciences and TechnologyOostende

Personalised recommendations