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  1. By: Sulkava, S - Huhtala, K
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 2
    Date: 1997
    Page Range: 151--159
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Reif, V - Tornberg, Risto - Huhtala, K
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 243--249
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-