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  1. By: Byrkjedal, Ingvar,
    Type: Article
    In: The Wilson bulletin
    Volume: 101
    Issue: 4
    Date: 1989
    Page Range: 579--590
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Byrkjedal, Ingvar,
    Type: Article
    In: The Wilson bulletin
    Volume: 97
    Issue: 4
    Date: 1985
    Page Range: 486--501
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-