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  1. By: Mayert, Sjoerd - Coopmans, Paul, - Krabbe, Niels, - Isler, Morton L
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 134
    Issue: 2
    Date: 2014
    Page Range: 145--154
    Publication Info: London, British Ornithologists' Club, 1893-