Chen, Xingwu; Li, Yan; Zou, Lan Bifurcation of critical periods for planar Hamiltonian systems of degree \(2n-1\). (English) Zbl 1212.37077 J. Sichuan Univ., Nat. Sci. Ed. 46, No. 1, 11-14 (2009). MSC: 37K50 34C23 34C25 PDFBibTeX XMLCite \textit{X. Chen} et al., J. Sichuan Univ., Nat. Sci. Ed. 46, No. 1, 11--14 (2009; Zbl 1212.37077)
Zou, Lan; Chen, Xingwu Center conditions for polynomial Liénard equation. (English) Zbl 1199.34163 J. Sichuan Univ., Nat. Sci. Ed. 45, No. 5, 1051-1056 (2008). MSC: 34C05 34C07 PDFBibTeX XMLCite \textit{L. Zou} and \textit{X. Chen}, J. Sichuan Univ., Nat. Sci. Ed. 45, No. 5, 1051--1056 (2008; Zbl 1199.34163)