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  1. By: Penn, Ian E
    Type: Article
    In: Palaeontology
    Volume: 18
    Date: 1975
    Page Range: 865--869
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Penn, Ian E
    Type: Article
    In: Palaeontology
    Volume: 17
    Date: 1974
    Page Range: 553--563
    Publication Info: London, Palaeontological Association, 1957-
  3. By: Penn, Ian E
    Type: Article
    In: Palaeontology
    Volume: 14
    Date: 1971
    Page Range: 154--158
    Publication Info: London, Palaeontological Association, 1957-