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  1. By: Casado, Eva - Ferrer, Miguel (Ornithologist)
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 2
    Date: 2005
    Page Range: 168--173
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Ferrer, Miguel (Ornithologist)
    Type: Article
    In: The journal of raptor research
    Volume: 24
    Issue: 4
    Date: 1990
    Page Range: 77--79
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Balbontin, J - Ferrer, Miguel (Ornithologist)
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 3
    Date: 2002
    Page Range: 231--235
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Viñuela, Javier - Ferrer, Miguel (Ornithologist)
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 1
    Date: 1997
    Page Range: 92--101
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  5. By: Balbontin, J - Ferrer, Miguel (Ornithologist) - Casado, Eva
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 1
    Date: 2001
    Page Range: 20--23
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  6. By: Janss, G F E - Lazo, A - Ferrer, Miguel (Ornithologist)
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 2
    Date: 1999
    Page Range: 154--159
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-