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  1. By: De Solla, S R - Martin, P A - Ewins, P J - Barker, Michael E.
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 4
    Date: 2003
    Page Range: 307--314
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Martin, Pamela A. - De Solla, Shane R. - Ewins, Peter J. - Barker, Michael E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 119
    Issue: 1
    Date: 2005-01-01
    Page Range: 58--63
    Publication Info: Ottawa Ottawa Field-Naturalists' Club