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  1. By: Tverdokhlebov, Valentin P - Tverdokhlebova, Galina I - Benton, Michael J., - Storrs, Glenn W
    Type: Article
    In: Palaeontology
    Volume: 40
    Date: 1997
    Page Range: 157--166
    Publication Info: London, Palaeontological Association, 1957-