TY - JOUR AU - Rifford, Ludovic TI - On the existence of nonsmooth control-Lyapunov functions in the sense of generalized gradients JO - ESAIM: Control, Optimisation and Calculus of Variations PY - 2001 SP - 593 EP - 611 VL - 6 PB - EDP-Sciences UR - http://archive.numdam.org/item/COCV_2001__6__593_0/ LA - en ID - COCV_2001__6__593_0 ER -