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  1. By: Falk, Karl H - Salewski, Volker
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 6
    Issue: 2
    Date: 1999-09
    Page Range: 101--102
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Salewski, Volker - Falk, Karl H - Bairlein, Franz - Leisler, Bernd
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123
    Date: 2003
    Page Range: 48--51
    Publication Info: London, British Ornithologists' Club, 1893-