TY  - JOUR
AU  - E. A. Nazarov
TI  - Conditions for the existence of periodic trajectories in dynamic systems with cylindrical phase space
JO  - Differencialʹnye uravneniâ
PY  - 1970
SP  - 377
EP  - 380
VL  - 6
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1970_6_2_a18/
LA  - ru
ID  - DE_1970_6_2_a18
ER  -