@article{DE_1990_26_4_a1,
     author = {L. I. Danilov and A. G. Ivanov},
     title = {Effective sufficient conditions for uniform local controllability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {563--572},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a1/}
}