Jaume Giné, Jaume Llibre. Integrability, degenerate centers, and limit cycles for a class of polynomial differential systems. Computers & Mathematics with Applications, 51(9-10):1453-1462, 2006. [doi]
@article{GineL06,
title = {Integrability, degenerate centers, and limit cycles for a class of polynomial differential systems},
author = {Jaume Giné and Jaume Llibre},
year = {2006},
doi = {10.1016/j.camwa.2006.01.005},
url = {http://dx.doi.org/10.1016/j.camwa.2006.01.005},
researchr = {https://researchr.org/publication/GineL06},
cites = {0},
citedby = {0},
journal = {Computers & Mathematics with Applications},
volume = {51},
number = {9-10},
pages = {1453-1462},
}