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  1. By: Jeffery, Charlotte H
    Type: Article
    In: Palaeontology
    Volume: 40
    Date: 1997
    Page Range: 659--712
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Smith, Andrew B. - Gallemí, Jaume - Jeffery, Charlotte H - Ernst, Gesing - Ward, Peter D
    Type: Article
    In: Bulletin of the Natural History Museum. Geology series
    Volume: 55
    Date: 1999
    Page Range: 81--137
    Publication Info: Andover, Intercept,