Yin, Qun; Liu, Deqing Periodic solutions of a class of superquadratic second order Hamiltonian systems. (English) Zbl 0974.34039 Appl. Math., Ser. B (Engl. Ed.) 15, No. 3, 259-266 (2000). Reviewer: Bin Liu (Beijing) MSC: 34C25 37J40 70H05 PDF BibTeX XML Cite \textit{Q. Yin} and \textit{D. Liu}, Appl. Math., Ser. B (Engl. Ed.) 15, No. 3, 259--266 (2000; Zbl 0974.34039) Full Text: DOI OpenURL
Yin, Qun; Hong, Youcheng Periodic solutions of a class of Birkhoffian equations. (Chinese. English summary) Zbl 0903.58028 J. Nanjing Univ., Math. Biq. 14, No. 2, 252-257 (1997). MSC: 37G99 34C25 PDF BibTeX XML Cite \textit{Q. Yin} and \textit{Y. Hong}, J. Nanjing Univ., Math. Biq. 14, No. 2, 252--257 (1997; Zbl 0903.58028) OpenURL
Hong, Youcheng; Yin, Qun Periodic solutions of a class of second order Hamiltonian systems. (English) Zbl 0847.34048 J. Math. Res. Expo. 16, No. 1, 13-19 (1996). Reviewer: Ding Tongren (Beijing) MSC: 34C25 37G99 37J99 PDF BibTeX XML Cite \textit{Y. Hong} and \textit{Q. Yin}, J. Math. Res. Expo. 16, No. 1, 13--19 (1996; Zbl 0847.34048) OpenURL
Yin, Qun; Hong, Youcheng Forced oscillations of a class of second order Hamiltonian systems. (Chinese) Zbl 0819.34030 Chin. Ann. Math., Ser. A 15, No. 6, 701-705 (1994). Reviewer: Huang Qiyu (Fujian) MSC: 34C25 70H05 37J99 PDF BibTeX XML Cite \textit{Q. Yin} and \textit{Y. Hong}, Chin. Ann. Math., Ser. A 15, No. 6, 701--705 (1994; Zbl 0819.34030) OpenURL