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  1. By: Koenen, Marcus T - Koenen, Sarah Gale - Yanez, Norma
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 1
    Date: 2000
    Page Range: 33--36
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Koenen, Marcus T - Leslie, David M - Gregory, Mark
    Type: Article
    In: The Wilson bulletin
    Volume: 108
    Issue: 2
    Date: 1996
    Page Range: 292--301
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-