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  1. By: Cleal, Christopher J., - Zodrow, Erwin L.,
    Type: Article
    In: Palaeontology
    Volume: 32
    Date: 1989
    Page Range: 837--882
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Zodrow, Erwin L., - Cleal, Christopher J.,
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 65--79
    Publication Info: London, Palaeontological Association, 1957-