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  1. By: Tobias, Joseph A. - Ekstrom, Jonathan M. M.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 122
    Date: 2002
    Page Range: 282--285
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Seddon, Nathalie - Capper, David R - Ekstrom, Jonathan M. M. - Isherwood, I S - Muna, R - Pople, R G - Tarimo, E - Timothy, J
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 3
    Issue: 2
    Date: 1996-09
    Page Range: 90--95
    Publication Info: Cambridge, African Bird Club, 1994-