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  1. By: Morel, G J - Morel, M-Y
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 33
    Date: 1982
    Page Range: 249--268
    Publication Info: Bonn, Das Forschungsinstitut,
  2. By: Morel, G J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 109
    Date: 1989
    Page Range: 4--9
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Morel, G J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 100
    Date: 1980
    Page Range: 66--68
    Publication Info: London, British Ornithologists' Club, 1893-