%0 Journal Article
%A M. I. Zelikin
%A V. F. Borisov
%T Fields of optimal trajectories that contain second-order singular
%J Doklady Akademii Nauk
%D 1989
%P 1050-1053
%V 304
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_304_5_a4/
%G ru
%F DAN_1989_304_5_a4