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  1. By: Johnson, E D H - Farnsworth, S. John
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 7--9
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Farnsworth, S. John - Coomber, Richard F - Jones, Phil - Madge, Steve C - Webb, Richard - Witherick, Mike
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 7
    Issue: 1
    Date: 2000-03
    Page Range: 34--46
    Publication Info: Cambridge, African Bird Club, 1994-