%0 Journal Article %A A. A. Melikyan %T Singular characteristics of first-order partial differential equations in optimal control and differential games %J Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory %D 1999 %P 179-196 %V 64 %I mathdoc %U http://geodesic.mathdoc.fr/item/INTO_1999_64_a6/ %G ru %F INTO_1999_64_a6