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  1. By: Simmons, M D - Emery, D. - Pickard, N A H
    Type: Article
    In: Palaeontology
    Volume: 34
    Date: 1991
    Page Range: 955--961
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Banner, F. T. (Frederick Thomas), - Simmons, M D - Whittaker, John E
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 47
    Date: 1991
    Page Range: 101--152
    Publication Info: London, BM(NH),
  3. By: Schroeder, R - Simmons, M D
    Type: Article
    In: The Bulletin of zoological nomenclature
    Volume: 45
    Date: 1988
    Page Range: 254--257
    Publication Info: London International Trust for Zoological Nomenclature