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B. Andreianov-laboratoire-de-mathématiques and C. , UMR 6623 -Université de Franche-Comte 16, route de Gray 25030 Besancon France e-mail: boris.andreianov@univ-fcomte, fr Mohamed Karimou Gazibo Laboratoire de Mathématiques CNRS : UMR 6623 -Université de Franche-Comte 16