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  1. By: Steinheimer, Frank D - Sammler, Svenja
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 127
    Date: 2007
    Page Range: 167--168
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Sammler, Svenja - Steinheimer, Frank D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 128
    Date: 2008
    Page Range: 254--259
    Publication Info: London, British Ornithologists' Club, 1893-