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  1. By: Fjeldså, Jon - Mayr, Gerald - Jønsson, Knud A - Irestedt, Martin
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 133
    Issue: 1
    Date: 2013
    Page Range: 72--75
    Publication Info: London, British Ornithologists' Club, 1893-