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  1. By: Costa, Lucy I. - Downie, Charles
    Type: Article
    In: Palaeontology
    Volume: 19
    Date: 1976
    Page Range: 591--614
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Liengjarern, M - Costa, Lucy I. - Downie, C
    Type: Article
    In: Palaeontology
    Volume: 23
    Date: 1980
    Page Range: 475--499
    Publication Info: London, Palaeontological Association, 1957-