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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: Helbig, Andreas J
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 51
    Date: 2003
    Page Range: 105--108
    Publication Info: Bonn, Das Forschungsinstitut,
  3. By: Shirihai, Hadoram - Kirwan, Guy M - Helbig, Andreas J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 131
    Issue: 4
    Date: 2011
    Page Range: 270--291
    Publication Info: London, British Ornithologists' Club, 1893-