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  1. By: Ahlberg, Per
    Type: Article
    In: Palaeontology.
    Volume: 32
    Date: 1989
    Page Range: 553--570
    Publication info: London :Palaeontological Association,1957-
  2. By: Ahlberg, Per
    Type: Article
    In: Palaeontology.
    Volume: 38
    Date: 1995
    Page Range: 259--285
    Publication info: London :Palaeontological Association,1957-