@article{TM_2012_277_a12,
     author = {M. S. Nikol'skii},
     title = {On the time-optimal problem for three- and four-dimensional control systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {192--198},
     publisher = {mathdoc},
     volume = {277},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2012_277_a12/}
}