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. Lafma, rue Saint-Leu, 80039 Amiens Cedex 1, France E-mail address

L. Cedex and E. France, -mail address: martin.saraleguiaranguren@univ-artois.fr Département de Mathématiques 1, 59655 Villeneuve d'Ascq Cedex, France E-mail address: Daniel.Tanre@univ-lille1