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P. Vidotto, F. Dal-'bo, I. , U. De-rennes-i, and C. Beaulieu, 35042 Rennes Cedex. mail : francoise.dalbo@univ-rennes1.fr Marc Peigné & Jean-Claude Picaud LMPT, UMR 6083, Faculté des Sciences et Techniques, Parc de Grandmont, 37200 Tours. mail : peigne@univ-tours.fr, jean-claude.picaud@univ-tours