@article{MZM_1978_23_2_a8,
     author = {Yu. M. Semenov},
     title = {The controllability of the equation $\dot x=ux$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {253--259},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_2_a8/}
}