Chow, Shiu-Nee; Li, Chengzhi; Wang, Duo A simple proof of the uniqueness of periodic orbits in the 1:3 resonance problem. (English) Zbl 0691.58028 Proc. Am. Math. Soc. 105, No. 4, 1025-1032 (1989). Reviewer: K.Chang MSC: 37G99 34C05 PDFBibTeX XMLCite \textit{S.-N. Chow} et al., Proc. Am. Math. Soc. 105, No. 4, 1025--1032 (1989; Zbl 0691.58028) Full Text: DOI
Wang, Duo The critical points of the period function of \(x''-x^ 2(x-\alpha)(x- 1)=0(0\leq \alpha <1)\). (English) Zbl 0641.34029 Nonlinear Anal., Theory Methods Appl. 11, 1029-1050 (1987). Reviewer: Duo Wang MSC: 34C05 PDFBibTeX XMLCite \textit{D. Wang}, Nonlinear Anal., Theory Methods Appl. 11, 1029--1050 (1987; Zbl 0641.34029) Full Text: DOI