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  1. By: Oppel, Steffen - Schaefer, H. Martin (Hinrich Martin) - Schmidt, Veronika
    Type: Article
    In: The Wilson bulletin
    Volume: 115
    Issue: 4
    Date: 2003
    Page Range: 360--366
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Oppel, Steffen - Hervias, Sandra - Oliveira, Nuno - Pipa, Tania - Silva, Carlos - Geraldes, Pedro - Goh, Michelle - Immler, Eva - McKown, Matthew
    Type: Article
    In: Nature Conservation
    Volume: 7
    Date: 2014
    Page Range: 1-13
    Publication Info: Pensoft Publishers 2014
  3. By: Mack, Andrew L - Oppel, Steffen
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 126
    Date: 2006
    Page Range: 61--64
    Publication Info: London, British Ornithologists' Club, 1893-