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  1. By: Hering, Jens - Fuchs, Elmar - Heim, Wieland - Eilts, Hans-Jürgen - Barthel, Peter H - Winkler, Hans,
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 24
    Issue: 1
    Date: 2017-03
    Page Range: 49--62
    Publication Info: Cambridge, African Bird Club, 1994-