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URL : https://hal.archives-ouvertes.fr/hal-00657767

C. Nancy-université and I. B. , 70239, 54506 Vandoeuvre-l` es-Nancy Cedex, France E-mail: Madalina.Deaconu@inria, fr S. Herrmann Institut de Mathématiques de Bourgogne (IMB) -UMR 5584