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  1. By: Guilherme, João L
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 21
    Issue: 2
    Date: 2014-09
    Page Range: 155--168
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Guilherme, João L - Wit, Piet
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 22
    Issue: 2
    Date: 2015-09
    Page Range: 200--203
    Publication Info: Cambridge, African Bird Club, 1994-