@article{DAN_1962_144_6_a5,
     author = {Ya. N. Roitenberg},
     title = {On the determination of the state of a non-linear control system in phase space},
     journal = {Doklady Akademii Nauk},
     pages = {1225--1228},
     publisher = {mathdoc},
     volume = {144},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_6_a5/}
}