TY  - JOUR
AU  - G. A. Leonov
TI  - A frequency criterion for the existence of limit cycles of dynamical systems with a cylindrical phase space
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 2047
EP  - 2051
VL  - 23
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_12_a3/
LA  - ru
ID  - DE_1987_23_12_a3
ER  -