%0 Journal Article
%A V. F. Dem'yanov
%T Second-order approximation for a nonsmooth function
%J Doklady Akademii Nauk
%D 1989
%P 529-532
%V 309
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_309_3_a2/
%G ru
%F DAN_1989_309_3_a2