%0 Journal Article
%A O. A. Danilova
%A A. S. Matveev
%T Non-traditional conditions for the existence of an optimal control for the Goursat--Darboux equations
%J Izvestiya. Mathematics 
%D 1998
%P 929-951
%V 62
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1998_62_5_a2/
%G en
%F IM2_1998_62_5_a2