@article{ZVMMF_1979_19_6_a4,
     author = {A. A. Lyubushin},
     title = {Modifications and convergence of successive approximations for optimal control problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1414--1421},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_6_a4/}
}