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M. Laboratoire-de, C. Et-physique-théorique, and . Umr, Fédération Denis Poisson Parc de Grandmont, 37200 Tours, France E-mail address: barles@lmpt.univ-tours E-mail address: emmanuel.chasseigne@lmpt.univ-tours.fr CEREMADE, UMR CNRS 7534, CNRS UMR, vol.6083, issue.6083, pp.75775-75791