%0 Journal Article
%A A. N. Burdukovskii
%T Conditions for the optimality of singular controls in the Goursat--Darboux problem
%J Diskretnyj analiz i issledovanie operacij
%D 1985
%P 31-39
%N 26
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DA_1985_26_a2/
%G ru
%F DA_1985_26_a2