@article{DE_1971_7_12_a20,
     author = {G. P. Karpenko},
     title = {Construction of program controls in certain nonlinear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2276--2278},
     year = {1971},
     volume = {7},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_12_a20/}
}