@article{DE_1981_17_3_a7,
     author = {A. S. Sokhin},
     title = {Some problems of optimal control for a nonlinear control system described by an oscillation equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {501--509},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_3_a7/}
}