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  1. By: Rahbek, Carsten - Bloch, Hanne - Poulsen, Michael Koie - Rasmussen, Jan Fischer
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 113
    Date: 1993
    Page Range: 103--108
    Publication Info: London, British Ornithologists' Club, 1893-