TY  - JOUR
AU  - V. E. Chernyshev
TI  - Existence of closed trajectories in the neighborhood of an invariant torus
JO  - Differencialʹnye uravneniâ
PY  - 1979
SP  - 1620
EP  - 1631
VL  - 15
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1979_15_9_a9/
LA  - ru
ID  - DE_1979_15_9_a9
ER  -