%0 Journal Article %A Rifford, Ludovic %T On the existence of nonsmooth control-Lyapunov functions in the sense of generalized gradients %J ESAIM: Control, Optimisation and Calculus of Variations %D 2001 %P 593-611 %V 6 %I EDP-Sciences %U http://archive.numdam.org/item/COCV_2001__6__593_0/ %G en %F COCV_2001__6__593_0