@article{05793505, title = {Uniqueness of limit cycles for a class of cubic systems with two invariant straight lines.}, journal = {Discrete Dynamics in Nature and Society}, volume = {2010}, year = {2010}, doi = {10.1155/2010/737068}, zbl = {1229.34046}, language = {en}, url = {http://dml.mathdoc.fr/item/05793505} }
Xie, Xiangdong; Chen, Fengde; Zhan, Qingyi. Uniqueness of limit cycles for a class of cubic systems with two invariant straight lines.. Discrete Dynamics in Nature and Society, Tome 2010 (2010) . doi : 10.1155/2010/737068. http://gdmltest.u-ga.fr/item/05793505/