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  1. By: Dixon, Owen A. - Bolton, Thomas Elwood, - Copper, Paul
    Type: Article
    In: Palaeontology
    Volume: 29
    Date: 1986
    Page Range: 391--413
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Dixon, Owen A.
    Type: Article
    In: Palaeontology
    Volume: 13
    Date: 1970
    Page Range: 52--63
    Publication Info: London, Palaeontological Association, 1957-