Perch-Nielsen, K.; Sadek, A.; Barakat, M. G.; Teleb, F. (1978). Late Cretaceous and Early Tertiary Calcareous nannofossil and Planktonic foraminifera zones from Egypt. (in Actes du VI Colloque Africain de Micropaléontologie - Tunis 1974). Annales des Mines et de la Géologie Tunis. 28: 337-403.
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Perch-Nielsen, K.; Sadek, A.; Barakat, M. G.; Teleb, F.
1978
Late Cretaceous and Early Tertiary Calcareous nannofossil and Planktonic foraminifera zones from Egypt. (in Actes du VI Colloque Africain de Micropaléontologie - Tunis 1974)