@article{DE_1971_7_10_a4,
     author = {M. I. Gusev and A. B. Kurzhanskii},
     title = {On the optimization of control systems in the presence of {constraints.~I,} {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1789--1800},
     publisher = {mathdoc},
     volume = {7},
     number = {10},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_10_a4/}
}