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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: Hermes, Claudia - Döpper, Annika - Schaefer, H. Martin (Hinrich Martin) - Segelbacher, Gernot
    Type: Article
    In: Nature Conservation
    Volume: 16
    Date: 2016
    Page Range: 39-58
    Publication Info: Pensoft Publishers 2016