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By: Oppel, Steffen - Schaefer, H. Martin (Hinrich Martin) - Schmidt, VeronikaType: ArticleIn: The Wilson bulletinVolume: 115Series:Issue: 4Date: 2003Page Range: 360--366Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Oppel, Steffen - Hervias, Sandra - Oliveira, Nuno - Pipa, Tania - Silva, Carlos - Geraldes, Pedro - Goh, Michelle - Immler, Eva - McKown, MatthewType: ArticleIn: Nature ConservationVolume: 7Series:Issue:Date: 2014Page Range: 1-13Publication Info: Pensoft Publishers 2014Subjects:
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By: Mack, Andrew L - Oppel, SteffenType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 126Series:Issue:Date: 2006Page Range: 61--64Publication Info: London, British Ornithologists' Club, 1893-Subjects: