@article{DE_1976_12_12_a10,
     author = {N. N. Petrov},
     title = {Local controllability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2214--2222},
     publisher = {mathdoc},
     volume = {12},
     number = {12},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_12_a10/}
}