TY  - JOUR
AU  - Yu. V. Malyshev
AU  - V. P. Zakharov
TI  - Investigation of the existence and convexity of limit cycles by the method of generalized Lyapunov functions
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 212
EP  - 216
VL  - 25
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_2_a4/
LA  - ru
ID  - DE_1989_25_2_a4
ER  -