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  1. By: Olea, P P - Vera, Rubén - De Frutos, A - Robles, H
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 278--282
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-