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  1. By: Alvin, K L - Fraser, C J - Spicer, R A
    Type: Article
    In: Palaeontology
    Volume: 24
    Date: 1981
    Page Range: 759--778
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Alvin, K L - Watson, G J - Spicer, R A
    Type: Article
    In: Palaeontology
    Volume: 37
    Date: 1994
    Page Range: 173--180
    Publication Info: London, Palaeontological Association, 1957-