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  1. By: Lehmann, Ulrich
    Type: Article
    In: Palaeontology
    Volume: 22
    Date: 1979
    Page Range: 265--271
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Lehmann, Ulrich
    Type: Article
    In: Palaeontology
    Volume: 14
    Date: 1971
    Page Range: 338--341
    Publication Info: London, Palaeontological Association, 1957-