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  1. By: Casado, E - Ferrer, M
    Type: Article
    In: The journal of raptor research.
    Volume: 39
    Issue: 2
    Date: 2005
    Page Range: 168--173
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-
  2. By: Balbontin, J - Ferrer, M - Casado, E
    Type: Article
    In: The journal of raptor research.
    Volume: 35
    Issue: 1
    Date: 2001
    Page Range: 20--23
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-