The following publications are possibly variants of this publication:
- On the Number and Distributions of Limit cycles of a Planar quartic Vector FieldYuhai Wu, Maoan Han. IJBC, 23(4), 2013. [doi]
- The Number and Distributions of Limit Cycles for a Class of Quintic Near-Hamiltonian SystemsHong Zang, Maoan Han, Tonghua Zhang, Moses O. Tadé. cma, 52(10-11):1577-1594, 2006. [doi]
- 3-Equivariant Planar Quintic Vector FieldYunlei Ma, Yuhai Wu. IJBC, 25(5), 2015. [doi]
- Limit cycles of planar polynomial vector fieldsMaoan Han, Jibin Li, Chengzhi Li. scholarpedia, 5(8):9648, 2010. [doi]