@article{INTO_1999_64_a6,
     author = {A. A. Melikyan},
     title = {Singular characteristics of first-order partial differential equations in optimal control and differential games},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {179--196},
     publisher = {mathdoc},
     volume = {64},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_1999_64_a6/}
}