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@article{DE_1979_15_4_a22, author = {N. N. Petrov}, title = {A remark on plane analytic control systems}, journal = {Differencialʹnye uravneni\^a}, pages = {743--744}, publisher = {mathdoc}, volume = {15}, number = {4}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_4_a22/} }
N. N. Petrov. A remark on plane analytic control systems. Differencialʹnye uravneniâ, Tome 15 (1979) no. 4, pp. 743-744. http://geodesic.mathdoc.fr/item/DE_1979_15_4_a22/