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  1. By: Lefebvre, Gaetan - Poulin, Brigitte - Mcneil, Raymond
    Type: Article
    In: The Wilson bulletin
    Volume: 104
    Issue: 3
    Date: 1992
    Page Range: 400--412
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Lefebvre, Gaetan - Poulin, Brigitte
    Type: Article
    In: The Wilson bulletin
    Volume: 108
    Issue: 4
    Date: 1996
    Page Range: 748--759
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-