@article{DE_1969_5_5_a0,
     author = {V. G. Boltyanskii},
     title = {A linear optimal control problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {783--799},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a0/}
}