Zhao, Qianqian; Yu, Jiang Limit cycles of a class of discontinuous planar piecewise linear systems with three regions of Y-type. (English) Zbl 1431.34022 Qual. Theory Dyn. Syst. 18, No. 3, 1031-1054 (2019). MSC: 34A36 34C05 34C07 34C20 34C23 PDFBibTeX XMLCite \textit{Q. Zhao} and \textit{J. Yu}, Qual. Theory Dyn. Syst. 18, No. 3, 1031--1054 (2019; Zbl 1431.34022) Full Text: DOI
García, Antonio An \(n\) center problem as an example of a geodesic billiard map with singularities: Poincaré maps and dynamics. (English) Zbl 1342.37062 Qual. Theory Dyn. Syst. 14, No. 2, 209-225 (2015). MSC: 37J15 70H05 37D50 70K25 37M05 PDFBibTeX XMLCite \textit{A. García}, Qual. Theory Dyn. Syst. 14, No. 2, 209--225 (2015; Zbl 1342.37062) Full Text: DOI
Yang, Xiao-Song Construction of smooth sphere maps with given degree and a generalization of Morse index formula for smooth vector fields. (English) Zbl 1318.58002 Qual. Theory Dyn. Syst. 14, No. 1, 139-147 (2015). Reviewer: Dorin Andrica (Riyadh) MSC: 58C25 58C99 PDFBibTeX XMLCite \textit{X.-S. Yang}, Qual. Theory Dyn. Syst. 14, No. 1, 139--147 (2015; Zbl 1318.58002) Full Text: DOI