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  1. By: Baker, Edward - Johnson, Kenneth G - Young, Jeremy R.
    Type: Article
    In: ZooKeys
    Volume: 150
    Date: 2011
    Page Range: 397-405
    Publication Info: Sofia, Bulgaria Pensoft Publishers
  2. By: Johnson, Kenneth G
    Type: Article
    In: Palaeontology
    Volume: 41
    Date: 1998
    Page Range: 1247--1268
    Publication Info: London, Palaeontological Association, 1957-