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  1. By: Shirihai, Hadoram - Gargallo, Gabriel - Helbig, Andreas J - Harris, Alan - Cottridge, David
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 9
    Issue: 2
    Date: 2002-08
    Page Range: 110--121
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Gargallo, Gabriel
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 114
    Date: 1994
    Page Range: 31--36
    Publication Info: London, British Ornithologists' Club, 1893-