%0 Journal Article
%A V. G. Boltyanskii
%T Sufficient conditions for optimality
%J Doklady Akademii Nauk
%D 1961
%P 994-997
%V 140
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_140_5_a2/
%G ru
%F DAN_1961_140_5_a2