Huang, Jianfeng; Liang, Haihua A geometric criterion for equation \(\dot{x} = \sum\nolimits_{i = 0}^m a_i(t) x^i\) having at most \(m\) isolated periodic solutions. (English) Zbl 1436.34036 J. Differ. Equations 268, No. 10, 6230-6250 (2020). MSC: 34C25 37C60 PDFBibTeX XMLCite \textit{J. Huang} and \textit{H. Liang}, J. Differ. Equations 268, No. 10, 6230--6250 (2020; Zbl 1436.34036) Full Text: DOI arXiv
Huang, Jianfeng; Liang, Haihua A uniqueness criterion of limit cycles for planar polynomial systems with homogeneous nonlinearities. (English) Zbl 1378.34049 J. Math. Anal. Appl. 457, No. 1, 498-521 (2018). Reviewer: Douglas S. Shafer (Charlotte) MSC: 34C07 37C27 34C05 PDFBibTeX XMLCite \textit{J. Huang} and \textit{H. Liang}, J. Math. Anal. Appl. 457, No. 1, 498--521 (2018; Zbl 1378.34049) Full Text: DOI
Huang, Jianfeng; Liang, Haihua Estimate for the number of limit cycles of Abel equation via a geometric criterion on three curves. (English) Zbl 1382.34031 NoDEA, Nonlinear Differ. Equ. Appl. 24, No. 4, Paper No. 47, 31 p. (2017). MSC: 34C07 PDFBibTeX XMLCite \textit{J. Huang} and \textit{H. Liang}, NoDEA, Nonlinear Differ. Equ. Appl. 24, No. 4, Paper No. 47, 31 p. (2017; Zbl 1382.34031) Full Text: DOI