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  1. By: Bates, John M. (John Mark), - Parker, Theodore A. - Capparella, Angelo P. (Angelo Paul), - Davis, Tristan J.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 112
    Date: 1992
    Page Range: 86--98
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Vuilleumier, François, - Capparella, Angelo P. (Angelo Paul), - Lazo, Ivan
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 113
    Date: 1993
    Page Range: 85--87
    Publication Info: London, British Ornithologists' Club, 1893-