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  1. By: Bertran, Joan. - Margalida, A
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 3
    Date: 1997
    Page Range: 287--288
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Negro, J J - Margalida, A
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 1
    Date: 2000
    Page Range: 62--63
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Bertran, Joan. - Margalida, A
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 1
    Date: 2002
    Page Range: 66--70
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-