%0 Journal Article
%A Pierpaolo Soravia
%T A degenerate elliptic equation for second order controllability of nonlinear systems
%J Minimax theory and its applications
%D 2020
%V 5
%N 2
%U http://geodesic.mathdoc.fr/item/MTA_2020_5_2_a14/
%F MTA_2020_5_2_a14