TY  - JOUR
AU  - A. P. Sadovskii
TI  - Solution of the problem of the center and focus for a Li\'enard system with polynomial coefficients
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 2102
EP  - 2104
VL  - 11
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_11_a23/
LA  - ru
ID  - DE_1975_11_11_a23
ER  -