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  1. By: Williams, Alwyn - Popov, Leonid E - Holmer, Lars E - Cusack, Maggie
    Type: Article
    In: Palaeontology
    Volume: 41
    Date: 1998
    Page Range: 221--262
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Walton, Derek - Cusack, Maggie - Curry, Gordon B.
    Type: Article
    In: Palaeontology
    Volume: 36
    Date: 1993
    Page Range: 883--896
    Publication Info: London, Palaeontological Association, 1957-