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@article{DE_1987_23_5_a7, author = {A. A. Levakov}, title = {On the controllability of linear nonstationary systems}, journal = {Differencialʹnye uravneni\^a}, pages = {798--806}, publisher = {mathdoc}, volume = {23}, number = {5}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a7/} }
A. A. Levakov. On the controllability of linear nonstationary systems. Differencialʹnye uravneniâ, Tome 23 (1987) no. 5, pp. 798-806. http://geodesic.mathdoc.fr/item/DE_1987_23_5_a7/