@article{DE_1967_3_12_a7,
     author = {R. Gabasov and S. V. Churakova},
     title = {The existence of optimal controls in systems with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2067--2080},
     publisher = {mathdoc},
     volume = {3},
     number = {12},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_12_a7/}
}