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  1. By: Hedenstrom, A - Bensch, Staffan, - Hasselquist, D - Ottosson, Ulf
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 194--197
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Pearson, David (David L.) - Kerton, Ian - Amakobe, Bernard - Bensch, Staffan,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 132
    Issue: 2
    Date: 2012
    Page Range: 124--127
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Pearson, D J - Kennerley, P R - Bensch, Staffan,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 128
    Date: 2008
    Page Range: 136--138
    Publication Info: London, British Ornithologists' Club, 1893-