@article{ZVMMF_2006_46_10_a4,
     author = {R. R. Ismailov and K. B. Mansimov},
     title = {Optimality conditions in a~step control problem},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1758--1770},
     year = {2006},
     volume = {46},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2006_46_10_a4/}
}