Restricting the h-index to a citation time window: A case study of a   timed Hirsch index
  The h-index has been shown to increase in many cases mostly because of citations to rather old publications. This inertia can be circumvented by restricting the evaluation to a citation time window. Here I report results of an empirical study analyzing the evolution of the thus defined timed h-index in dependence on the length of the citation time window. 
Michael Schreiber
cs.DL physics.soc-ph