TY  - JOUR
AU  - Pierpaolo Soravia
TI  - A degenerate elliptic equation for second order controllability of nonlinear systems
JO  - Minimax theory and its applications
PY  - 2020
VL  - 5
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/MTA_2020_5_2_a14/
ID  - MTA_2020_5_2_a14
ER  -