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  1. By: Gwiazdowicz, Dariusz J., - Mizera, Tadeusz, - Skorupski, M
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 3
    Date: 1999
    Page Range: 257--260
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Blaszak, Czeslaw. - Skorupski, M - Ehrnsberger, Rainer.
    Type: Article
    In: Spixiana
    Volume: 27
    Date: 2004
    Page Range: 165--178
    Publication Info: Mchen, Zoologische Staatssammlung Mchen,