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• Current address : A. Guezane-Lakoud andS. Kouachi; Laboratory of Advanced Materials, Fac- ulty of Sciences, Badji Mokhtar-Annaba University, P.O. Box 12, 23000 Annaba, ALGERIA, F. Ellaggoune; Laboratory of Applied Mathematics and Modeling, University 8 mai 1945 - Guelma, P.O. Box 401, Guelma 24000, ALGERIA