@article{TM_1977_143_a3,
     author = {V. I. Blagodatskikh},
     title = {The controllability problem for linear systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {57--67},
     year = {1977},
     volume = {143},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1977_143_a3/}
}