, Volume 69, Issue 1, pp 121–129 | Cite as

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 = T 1 / 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.


Scientific Research Output Item Density Information Production Process Standard Bibliometric Indicator Chemistry Research Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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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

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