1. Geochemical, mineralogical and sedimentological studies on phosphorites of the Nile Valley (Duwi Formation) between Qena and Idfu, Egypt;Abdel-Rahman,1992
2. Role of Upper Cretaceous oyster bioherms in the deposition and accumulation of high-grade phosphorites in central Jordan;Abed;Journal of Sedimentary Research,1998
3. The role of microbial activity in the formation of the high-grade Egyptian phosphorites;Ahmed;Bulletin of the Faculty of Science, Assiut University,1988
4. Sedimentological, mineralogical and geochemical characteristics of Upper Cretaceous Egyptian phosphorites with special reference to the microbial role in phosphogenesis;Ahmed,2002
5. Origin of Late Cretaceous phosphorites in Egypt;Baioumy;Cretaceous Research,2005