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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Jefferson, Timothy H
    Type: Article
    In: Palaeontology
    Volume: 25
    Date: 1982
    Page Range: 681--708
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Jefferson, Timothy H
    Type: Article
    In: Palaeontology
    Volume: 30
    Date: 1987
    Page Range: 233--249
    Publication Info: London, Palaeontological Association, 1957-