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  1. By: Allen, Bruce H. - Lewis, M
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 2
    Date: 1992
    Page Range: 355--357
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  2. By: Jefferies, R P S - Lewis, M - Donovan, Stephen K.
    Type: Article
    In: Palaeontology
    Volume: 30
    Date: 1987
    Page Range: 429--484
    Publication Info: London, Palaeontological Association, 1957-