@article{DE_2003_39_2_a8,
     author = {Yu. V. Masterkov and L. I. Rodina},
     title = {Sufficient and {Necessary} {Conditions} for the {Stable} {Controllability} of a {Nonlinear} {Nonstationary} {System} on the {Plane} in the {Critical} {Case}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {227--235},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_2_a8/}
}