@article{ZVMMF_1973_13_6_a26,
     author = {G. K. Zakharov},
     title = {Necessary optimality conditions for problems with two groups of controls with bounded phase coordinates},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1612--1619},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1973_13_6_a26/}
}