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By: Brunel, J. - Chappuis, Claude, - Érard, ChristianType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 100Series:Issue:Date: 1980Page Range: 164--170Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Morel, Gerard J - Chappuis, Claude,Type: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 122ASeries:Issue:Date: 1992Page Range: 217--224Publication Info: London, British Ornithologists' Club, 1893-Subjects: