@article{DE_1979_15_12_a5,
     author = {N. N. Petrov},
     title = {An analogue of the {Birkhoff} theory for invariant sets of control systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2155--2160},
     publisher = {mathdoc},
     volume = {15},
     number = {12},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_12_a5/}
}