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  1. By: Pravosudov, Vladimir V
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 3
    Date: 1993
    Page Range: 475--482
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Pravosudov, Vladimir V - Pravosudova, Elena V
    Type: Article
    In: The Wilson bulletin
    Volume: 108
    Issue: 1
    Date: 1996
    Page Range: 80--93
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-