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  1. By: Herzog, Sebastian K - Fjeldså, Jon - Kessler, Michael - Balderrama, José A
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 119
    Date: 1999
    Page Range: 162--177
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Vargas, Aideé - Balderrama, José A
    Type: Article
    In: Mastozoología neotropical
    Date: 2009-12-01