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  1. By: Ferrero Cantisán, Juan José, - Grande, Juan Manuel - Negro, J J
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 1
    Date: 2003
    Page Range: 1--7
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Negro, J J - Grande, Juan Manuel - Sarasola, José Hernán
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 287--288
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Negro, J J - Bustamante, Javier - Melguizo, C - Ruiz, J L - Grande, Juan Manuel
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 4
    Date: 2000
    Page Range: 327--329
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-