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  1. By: Mcgrady, Michael J - Potapov, E - Utekhina, I. G.
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 4
    Date: 1999
    Page Range: 342--343
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Utekhina, I. G.
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 1
    Date: 1994
    Page Range: 66--66
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-