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  1. By: Gorman, M L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 99
    Date: 1979
    Page Range: 9--12
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Gorman, M L
    Type: Article
    In: Revue suisse de zoologie
    Volume: 97
    Date: 1990
    Page Range: 3--29
    Publication Info: Genève, Kundig [etc.],