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MOHAMED BENZAGGAGH, and FABRIZIO CECCA, and ISABELLE ROUGET, (2010) Biostratigraphic distribution of ammonites and calpionellids in the tithonian of the Prerif (Msila area, Morocco). Palâontologische Zeitshrift, Stuttgart(Spinger), Volume 84,N° 84.p .301-315, 2010.