@article{ZVMMF_1967_7_2_a1,
     author = {I. B. Vapnyarskii},
     title = {An existence theorem for optimal control in the {Boltz} problem, some of its applications and the necessary conditions for the optimality of moving and singular systems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {259--283},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_2_a1/}
}