Institution: | a G-SCOP, CNRS, Grenoble-InP, 46, Avenue Félix Viallet, 38000 Grenoble, France b Arts et Métiers ParisTech, 4, rue Augustin Fresnel, 57070 Metz, France c Ecole Polytechnique de Montréal, Department of mathematics and industrial engineering, CP 6079, succ Centre-Ville, Montreal, Quebec H3C3A7, Canada |