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  1. By: Sørensen, Uffe Gjol - Bech, Jorgen - Krabbe, Erling
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 145--155
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Sørensen, Uffe Gjol - Bech, Jorgen - Halberg, Kaj - Krabbe, Erling
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 4
    Issue: 1
    Date: 1997-03
    Page Range: 29--30
    Publication Info: Cambridge, African Bird Club, 1994-