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  1. By: Beheim, Janne. - Eldegard, K - Bjørnstad, Gro. - Isaksson, Mats - Sonerud, G - Heie, O - Klungland, Helge
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 3
    Date: 2002
    Page Range: 218--219
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-