TY  - JOUR
AU  - Yu. S. Ilyashenko
TI  - The origin of limit cycles under perturbation of the equation $\dfrac{dw}{dz}=-\dfrac{R_z}{R_w}$, where $R(z,w)$ is a~polynomial
JO  - Sbornik. Mathematics
PY  - 1969
SP  - 353
EP  - 364
VL  - 7
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1969_7_3_a4/
LA  - en
ID  - SM_1969_7_3_a4
ER  -