@article{DAN_1978_243_4_a10,
     author = {A. I. Subbotin and N. N. Subbotina},
     title = {Necessary and sufficient conditions for a piecewise smooth value of a differential game},
     journal = {Doklady Akademii Nauk},
     pages = {862--865},
     publisher = {mathdoc},
     volume = {243},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_243_4_a10/}
}