TY  - JOUR
AU  - Gavrilov, Lubomir
TI  - On the center-focus problem for the equation $\protect \frac{\protect \mathrm{d}y}{\protect \mathrm{d}x} + \Sigma _{i=1}^{n} a_i(x) y^i = 0, 0\le x \le 1$ where $a_i$ are polynomials
JO  - Annales Henri Lebesgue
PY  - 2020
SP  - 615
EP  - 648
VL  - 3
PB  - ÉNS Rennes
UR  - http://archive.numdam.org/articles/10.5802/ahl.41/
DO  - 10.5802/ahl.41
LA  - en
ID  - AHL_2020__3__615_0
ER  -