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  1. By: Norman, David B
    Type: Article
    In: Palaeontology
    Volume: 35
    Date: 1992
    Page Range: 247--256
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Taylor, Michael A. - Norman, David B - Cruickshank, Arthur
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 357--360
    Publication Info: London, Palaeontological Association, 1957-