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  1. By: Pontoppidan, Maj-Britt - Nachman, Gösta
    Type: Article
    In: Nature conservation
    Volume: 5
    Date: 2013
    Page Range: 13-28
    Publication Info: Sofia, Bulgaria Pensoft Publishers 2012-
  2. By: Pontoppidan, Maj-Britt - Nachman, Gösta
    Type: Article
    In: Nature conservation
    Volume: 5
    Date: 2013
    Page Range: 29-52
    Publication Info: Sofia, Bulgaria Pensoft Publishers 2012-