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@article{DAN_1991_320_2_a8, author = {M. M. Khapaev}, title = {Conditions for the controllability of singularly perturbed systems}, journal = {Doklady Akademii Nauk}, pages = {300--302}, publisher = {mathdoc}, volume = {320}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a8/} }
M. M. Khapaev. Conditions for the controllability of singularly perturbed systems. Doklady Akademii Nauk, Tome 320 (1991) no. 2, pp. 300-302. http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a8/