@article{DE_1999_35_6_a0,
     author = {A. V. Arutyunov and V. N. Rozova},
     title = {Regular zeros of a quadratic mapping and local controllability of nonlinear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {723--728},
     publisher = {mathdoc},
     volume = {35},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_6_a0/}
}