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M. Département-de, Avenue de l'environnement, 5019 Monastir, Tunisie E-mail address: Walid.Aloulou@ipeim.rnu.tn Institut de Mathématiques de Bourgogne, UMR CNRS 5584, E-mail address: Didier.Arnal@u-bourgogne.fr Département de Mathématiques