%0 Journal Article
%A A. A. Agrachev
%T A~second-order necessary condition for optimality in the general nonlinear case
%J Sbornik. Mathematics
%D 1977
%P 493-506
%V 31
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1977_31_4_a4/
%G en
%F SM_1977_31_4_a4