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C. Patrick, CNRS UMR 5219., 118 route de Narbonne, 31062 Toulouse cedex 09, France. E-mail address: cattiaux@math.univ-toulouse.fr José LÉ ON, Escuela de Matemática 1041-A, Venezuela. E-mail address: jose.leon@ciens.ucv.ve Clémentine PRIEUR