%0 Journal Article %A K. K. Gasanov %T The existence of optimal controls for processes that are described by a system of hyperbolic equations %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1973 %P 599-608 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1973_13_3_a6/ %G ru %F ZVMMF_1973_13_3_a6