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  1. By: Donovan, Stephen K. - Sevastopulo, George D
    Type: Article
    In: Palaeontology
    Volume: 32
    Date: 1989
    Page Range: 689--710
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Simms, Michael J - Sevastopulo, George D
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 91--109
    Publication Info: London, Palaeontological Association, 1957-