Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1973_9_11_a23, author = {N. N. Petrov}, title = {Certain invariant sets of control systems}, journal = {Differencialʹnye uravneni\^a}, pages = {2095--2096}, publisher = {mathdoc}, volume = {9}, number = {11}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a23/} }
N. N. Petrov. Certain invariant sets of control systems. Differencialʹnye uravneniâ, Tome 9 (1973) no. 11, pp. 2095-2096. http://geodesic.mathdoc.fr/item/DE_1973_9_11_a23/