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  1. By: Hughes, Nigel C - Rushton, Adrian W A
    Type: Article
    In: Palaeontology
    Volume: 33
    Date: 1990
    Page Range: 429--445
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Rushton, Adrian W A - Powell, John H
    Type: Article
    In: Bulletin of the Natural History Museum. Geology series
    Volume: 54
    Date: 1998
    Page Range: 131--146
    Publication Info: Andover, Intercept,