@article{ZVMMF_1994_34_11_a3,
     author = {V. I. Elkin},
     title = {Subsystems of control systems and control problems with equality-type constraints on the phase variables},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1585--1596},
     publisher = {mathdoc},
     volume = {34},
     number = {11},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1994_34_11_a3/}
}