Fonda, Alessandro; Sabatini, Marco; Zanolin, Fabio Periodic solutions of perturbed Hamiltonian systems in the plane by the use of the Poincaré-Birkhoff theorem. (English) Zbl 1277.34046 Topol. Methods Nonlinear Anal. 40, No. 1, 29-52 (2012). Reviewer: Maite Grau (Lleida) MSC: 34C25 47H25 34C23 37E30 37E40 PDFBibTeX XMLCite \textit{A. Fonda} et al., Topol. Methods Nonlinear Anal. 40, No. 1, 29--52 (2012; Zbl 1277.34046)
Andres, Jan; Fürst, Tomás; Pastor, Karel Sharkovskii’s theorem, differential inclusions, and beyond. (English) Zbl 1189.34028 Topol. Methods Nonlinear Anal. 33, No. 1, 149-168 (2009). Reviewer: Francesca Papalini (Ancona) MSC: 34A60 37E15 37H10 47H04 47H40 34C05 PDFBibTeX XMLCite \textit{J. Andres} et al., Topol. Methods Nonlinear Anal. 33, No. 1, 149--168 (2009; Zbl 1189.34028) Full Text: DOI
Andres, Jan On the multivalued Poincaré operators. (English) Zbl 0909.47038 Topol. Methods Nonlinear Anal. 10, No. 1, 171-182 (1997). Reviewer: M.Kučera (Praha) MSC: 47H04 47H30 58C06 37G99 PDFBibTeX XMLCite \textit{J. Andres}, Topol. Methods Nonlinear Anal. 10, No. 1, 171--182 (1997; Zbl 0909.47038) Full Text: DOI