@article{DAN_1986_288_2_a6,
     author = {V. V. Kozlov},
     title = {On the stability of equilibria of nonholonomic systems},
     journal = {Doklady Akademii Nauk},
     pages = {289--291},
     publisher = {mathdoc},
     volume = {288},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_288_2_a6/}
}