@article{DAN_1988_302_1_a2,
     author = {V. I. Elkin},
     title = {Classification of affine controllable systems with a phase space of dimension $n<4$},
     journal = {Doklady Akademii Nauk},
     pages = {18--20},
     publisher = {mathdoc},
     volume = {302},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_302_1_a2/}
}