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  1. By: Payne, Robert B. - Sorenson, Michael D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 127
    Date: 2007
    Page Range: 4--26
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Payne, Robert B. - Sorenson, Michael D
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 51
    Date: 2003
    Page Range: 97--104
    Publication Info: Bonn, Das Forschungsinstitut,
  3. By: Barlow, Clive R - Payne, Robert B. - Payne, Laura L - Sorenson, Michael D
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 13
    Issue: 1
    Date: 2006-03
    Page Range: 45--48
    Publication Info: Cambridge, African Bird Club, 1994-