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  1. By: Eames, Jonathan C. - Trai, Le Trong - Cu, Nguyen
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 119
    Date: 1999
    Page Range: 4--15
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Robson, C R - Eames, Jonathan C. - Cu, Nguyen - La Truong, Van
    Type: Article
    In: Forktail
    Volume: 8
    Date: 1993
    Page Range: 25--52
    Publication Info: Oxford,