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  1. By: Patten, Michael A - Wilson, John C
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 266--270
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Clark, William S. - Patten, Michael A - Wilson, John C
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 129
    Date: 2009
    Page Range: 254--255
    Publication Info: London, British Ornithologists' Club, 1893-