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  1. By: Vannier, Jean - Siveter, David J. - Schallreuter, Roger E L
    Type: Article
    In: Palaeontology
    Volume: 32
    Date: 1989
    Page Range: 163--222
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Schallreuter, Roger E L - Siveter, David J.
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 577--598
    Publication Info: London, Palaeontological Association, 1957-