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  1. By: Giese, Alan R - Forsman, E D
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 2
    Date: 2003
    Page Range: 117--124
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Forsman, Eric D - Giese, Alan R
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 1
    Date: 1997
    Page Range: 28--41
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-