Bifurcation of Limit Cycles in a Fourth-Order Near-Hamiltonian System.

Maoan Han Desheng Shang Wang Zheng Pei Yu Bifurcation of Limit Cycles in a Fourth-Order Near-Hamiltonian System. 4117-4144 2007 17 I. J. Bifurcation and Chaos 11 http://dx.doi.org/10.1142/S0218127407019895 db/journals/ijbc/ijbc17.html#HanSZY07