@article{DE_1991_27_6_a9,
     author = {N. N. Petrov},
     title = {Control problems and separability axioms},
     journal = {Differencialʹnye uravneni\^a},
     pages = {988--994},
     publisher = {mathdoc},
     volume = {27},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_6_a9/}
}