TY  - JOUR
AU  - N. N. Bautin
TI  - Estimation of the number of algebraic limit cycles of the system $\dot x=P(x,\,y)$, $\dot y=Q(x,\,y)$ with algebraic right-hand sides
JO  - Differencialʹnye uravneniâ
PY  - 1980
SP  - 362
VL  - 16
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1980_16_2_a19/
LA  - ru
ID  - DE_1980_16_2_a19
ER  -