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  1. By: Sansom, Ivan J - Armstrong, Howard A - Smith, M Paul
    Type: Article
    In: Palaeontology
    Volume: 37
    Date: 1995
    Page Range: 781--799
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Armstrong, Howard A
    Type: Article
    In: Palaeontology
    Volume: 40
    Date: 1997
    Page Range: 763--797
    Publication Info: London, Palaeontological Association, 1957-