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A. Basdevant-anne-laure, basdevant@u-paris10.fr, Nathanaël Enriquez nenriquez@u-paris10.fr, Lucas Gerin lgerin@u-paris10

J. Gouéré-jean-baptiste, gouere@univ-orleans.fr MAPMO -Fédération Denis Poisson Université d'Orléans B, pp.6759-45067