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  1. By: Bustnes, Jan O. (Jan Ove) - Asheim, Magne - Bjørn, Tor Harry - Gabrielsen, Heidi - Systad, Geir H
    Type: Article
    In: The Wilson bulletin
    Volume: 112
    Issue: 1
    Date: 2000
    Page Range: 8--13
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-