TY  - JOUR
AU  - N. K. Alekseev
TI  - Some questions on the controllability of two-dimensional systems
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 387
EP  - 397
VL  - 13
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_3_a0/
LA  - ru
ID  - DE_1977_13_3_a0
ER  -