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  1. By: Margalida, Antoni - Bertran, Joan.
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 3
    Date: 2003
    Page Range: 252--256
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Margalida, Antoni - Bertran, Joan.
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 2
    Date: 2002
    Page Range: 154--155
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. 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-
  4. By: Margalida, Antoni - Bertran, Joan.
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 2
    Date: 2003
    Page Range: 157--160
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  5. 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-