@article{DAN_1964_155_1_a15,
     author = {B. N. Petrov and S. V. Emel'yanov and N. E. Kostyleva},
     title = {Control by linear systems with variable parameters},
     journal = {Doklady Akademii Nauk},
     pages = {61--64},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_1_a15/}
}