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C. Patrick and I. De-mathématiques-de-toulouse, CNRS UMR 5219 118 route de Narbonne, F-31062 Toulouse cedex 09. E-mail address: cattiaux@math.univ-toulouse.fr Arnaud GUILLIN, avenue des Landais 63177Aubì ere. E-mail address: guillin@math.univ-bpclermont, Laboratoire de Mathématiques