An, Tianqing Multiple periodic solutions of Hamiltonian systems with prescribed energy. (English) Zbl 1112.37048 J. Differ. Equations 236, No. 1, 116-132 (2007). MSC: 37J45 58E05 34C25 37J55 PDFBibTeX XMLCite \textit{T. An}, J. Differ. Equations 236, No. 1, 116--132 (2007; Zbl 1112.37048) Full Text: DOI
An, Tianqing The brake orbits of Hamiltonian systems on positive-type hypersurfaces. (English) Zbl 1107.37051 Positivity 10, No. 4, 681-692 (2006). MSC: 37J45 58E05 PDFBibTeX XMLCite \textit{T. An}, Positivity 10, No. 4, 681--692 (2006; Zbl 1107.37051) Full Text: DOI
An, Tianqing On the number of periodic orbits of Hamiltonian systems on positive-type hypersurfaces in \(\mathbb{R}^{2n}\). (English) Zbl 1053.37036 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 56, No. 4, 633-641 (2004). MSC: 37J45 34C25 47J30 PDFBibTeX XMLCite \textit{T. An}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 56, No. 4, 633--641 (2004; Zbl 1053.37036) Full Text: DOI
An, Tianqing Existence of multiple periodic orbits of Hamiltonian systems on positive-type hypersurfaces in \({\mathbb{R}}^{2n}\). (English) Zbl 1014.37010 J. Math. Anal. Appl. 278, No. 2, 376-396 (2003). MSC: 37B45 37G15 PDFBibTeX XMLCite \textit{T. An}, J. Math. Anal. Appl. 278, No. 2, 376--396 (2003; Zbl 1014.37010) Full Text: DOI