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  1. By: Jackson, D. E. (Dennis Edward), - Lenz, Alfred C
    Type: Article
    In: Palaeontology
    Volume: 15
    Date: 1972
    Page Range: 579--597
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Lenz, Alfred C - Mccracken, Alexander D
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 43
    Date: 1988-04-28
    Page Range: 265--271
    Publication Info: London, BM(NH),