%0 Journal Article
%A F. H. Clarke
%A Yu. S. Ledyaev
%A R. J. Stern
%T Complements, Approximations, Smoothings and Invariance Properties
%J Journal of convex analysis
%D 1997
%P 189-22
%V 4
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JCA_1997_4_2_a0/
%F JCA_1997_4_2_a0