@article{DAN_1994_337_5_a0,
     author = {S. A. Vakhrameev},
     title = {Once more on the bang-bang control theorem for smooth control},
     journal = {Doklady Akademii Nauk},
     pages = {567--569},
     year = {1994},
     volume = {337},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_337_5_a0/}
}