@article{DE_1987_23_3_a5,
     author = {V. I. Gurman and G. Konstantinov},
     title = {Description and estimate of sets of attainability of controllable systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {416--423},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_3_a5/}
}