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  1. By: Bahr, Norbert
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 130
    Date: 2010
    Page Range: 231--232
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Bruce, Murray D. - Bahr, Norbert - David, Normand
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 136
    Issue: 2
    Date: 2016
    Page Range: 86--100
    Publication Info: London, British Ornithologists' Club, 1893-