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  1. By: Hill, Christopher Richard - El-Khayal, A A
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 37
    Issue: 3
    Date: 1983-11-24
    Page Range: 105--112
    Publication Info: London, BM(NH),
  2. By: El-Khayal, A A - Romano, M
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 401--412
    Publication Info: London, Palaeontological Association, 1957-