@article{DE_2003_39_12_a8,
     author = {I. V. Chebunin},
     title = {Controllability {Conditions} for the {Riccati} {Equation}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1654--1661},
     publisher = {mathdoc},
     volume = {39},
     number = {12},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_12_a8/}
}