Hong, Chun; Zou, Lan Abelian integrals and critical periods for a class of reversible quadratic systems. (Chinese. English summary) Zbl 1274.34095 J. Sichuan Univ., Nat. Sci. Ed. 49, No. 5, 960-964 (2012). MSC: 34C08 37J45 34C25 34C05 34C14 PDFBibTeX XMLCite \textit{C. Hong} and \textit{L. Zou}, J. Sichuan Univ., Nat. Sci. Ed. 49, No. 5, 960--964 (2012; Zbl 1274.34095) Full Text: DOI
Gao, Bo; He, Zhirong Limit cycles of a class of planar system with \(1:2\) resonance for linear cusp. (Chinese. English summary) Zbl 1212.34101 J. Sichuan Univ., Nat. Sci. Ed. 46, No. 5, 1224-1228 (2009). MSC: 34C05 34C07 37G10 37G15 34C23 34C37 34E10 PDFBibTeX XMLCite \textit{B. Gao} and \textit{Z. He}, J. Sichuan Univ., Nat. Sci. Ed. 46, No. 5, 1224--1228 (2009; Zbl 1212.34101)