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@article{DE_1976_12_4_a8, author = {S. A. Nefedov and F. A. Sholokhovich}, title = {A criterion for $\varepsilon $-controllability of a linear system}, journal = {Differencialʹnye uravneni\^a}, pages = {653--657}, publisher = {mathdoc}, volume = {12}, number = {4}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a8/} }
S. A. Nefedov; F. A. Sholokhovich. A criterion for $\varepsilon $-controllability of a linear system. Differencialʹnye uravneniâ, Tome 12 (1976) no. 4, pp. 653-657. http://geodesic.mathdoc.fr/item/DE_1976_12_4_a8/