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  1. By: Zhou, Zhixin - Sun, Yue - Dong, Lu - Xia, Canwei - Lloyd, Huw - Zhang, Yanyun (Ornithologist)
    Type: Article
    In: Forktail
    Volume: 28
    Date: 2012
    Page Range: 62--66
    Publication Info: Oxford,
  2. By: Lloyd, Huw
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 120
    Date: 2000
    Page Range: 129--133
    Publication Info: London, British Ornithologists' Club, 1893-