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  1. By: Demey, Ron - Herroelen, Paul - Pedersen, Tommy
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 120
    Date: 2000
    Page Range: 154--172
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Pedersen, Tommy
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 4
    Issue: 2
    Date: 1997-09
    Page Range: 109--110
    Publication Info: Cambridge, African Bird Club, 1994-