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  1. By: Siverson, Mikael
    Type: Article
    In: Palaeontology
    Volume: 35
    Date: 1992
    Page Range: 519--554
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Siverson, Mikael
    Type: Article
    In: Palaeontology
    Volume: 39
    Date: 1996
    Page Range: 813--849
    Publication Info: London, Palaeontological Association, 1957-