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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gao, Zhifeng - Thomas, Barry A.
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 81--89
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Gao, Zhifeng - Thomas, Barry A.
    Type: Article
    In: Palaeontology
    Volume: 30
    Date: 1987
    Page Range: 815--828
    Publication Info: London, Palaeontological Association, 1957-