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  1. By: Hengstenberg, D W - Vilella, Francisco J.
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 4
    Date: 2005
    Page Range: 404--416
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Jensen, W J - Gregory, Mark S. - Baldassarre, Guy A - Vilella, Francisco J. - Bildstein, Keith L. (Keith Louis),
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 4
    Date: 2005
    Page Range: 417--428
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-