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  1. By: Krone, O
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 1
    Date: 2002
    Page Range: 84--86
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Krone, O - Scharnweber, Christian
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 2
    Date: 2003
    Page Range: 174--176
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-