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U. De-sousse, L. De, . Physique, . Spéciales, . Applications et al., SFAX, 3018, TUNISIE E-mail address: Walid.Aloulou@ipeim.rnu F-21078 DIJON CEDEX, FRANCE E-mail address: Didier.Arnal@u-bourgogne, AVENUE DE L'ENVIRONNEMENT, 5019 MONASTIR, TUNISIE E-mail address: Ridha.Chatbouri@ipeim.rnu.tn