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R. Escobedo, . Bcam-?-basque, . Center-for-applied, A. Mathematics, . Bilbao et al., de Deusto 7, 48013 Bilbao, Spain E-mail : escobedor@gmail.com ? Url : http://www.aepa-euskadi.org Campus Scientifique , 73376 Le Bourget-du-Lac, France ? E-mail : Denys.Dutykh@univ-savoie.fr Url : http://www.denys-dutykh, Dutykh, CNRS ? LAMA UMR 5127