%0 Journal Article
%A A. A. Agrachev
%A R. V. Gamkrelidze
%T Symplectic geometry and conditions necessary conditions for optimality
%J Sbornik. Mathematics
%D 1992
%P 29-45
%V 72
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1992_72_1_a1/
%G en
%F SM_1992_72_1_a1