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R. Diel, C. Mapmo, and . B. Umr, Fédération Denis Poisson FR 2964, Université d'Orléans, B.P. 6759, 45067 Orléans cedex 2 FRANCE. E-mail address: roland.diel@univ-orleans.fr Guillaume Voisin, MAPMO CNRS UMR 6628, Fédération Denis Poisson FR 2964