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  1. By: Corbacho, C - Sánchez, Juan M. - Sanchez, A
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 2
    Date: 1999
    Page Range: 117--122
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Villegas, Auxiliadora - Sanchez-Guzman, Juan Manuel - Costillo, E - Corbacho, C - Moran, R
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 4
    Date: 2004
    Page Range: 361--366
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-