TY  - JOUR
AU  - I. M. Belen'kii
TI  - Sufficient conditions for the absence of periodic trajectories of autonomous systems in the case of multiply connected regions
JO  - Differencialʹnye uravneniâ
PY  - 1967
SP  - 1248
EP  - 1252
VL  - 3
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1967_3_8_a2/
LA  - ru
ID  - DE_1967_3_8_a2
ER  -