TY  - JOUR
AU  - A. A. Shestakov
TI  - Tests for the instability of a set with respect to a nonautonomous differential system
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 958
EP  - 960
VL  - 13
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_5_a22/
LA  - ru
ID  - DE_1977_13_5_a22
ER  -