Email：zhangdz@nankai.edu.cn[1] Chungen Liu and Duanzhi Zhang, Seifert conjecture in the even convex case. Comm. Pure Appl. Math. 67（2014) 1563-1604.
[2] Duanzhi Zhang , Minimal period problems for brake orbits of nonlinear autonomous reversible semipositive Hamiltonian systems. Discrete Contin. Dyn. Syst. (to appear)
[3] Chungen Liu and Duanzhi Zhang, Iteration theory of L-index and multiplicity of brake orbits. J. Differential Equations 257 (2014), no. 4, 1194–1245.
[4] Duanzhi Zhang and Chungen Liu, Multiple brake orbits on compact convex symmetric reversible hypersurfaces in R2n. Ann. Inst. H. Poincaré Anal. Non Linéaire 31 (2014), no. 3, 531–554.
[5] Yijing Sun and Duanzhi, Zhang, The role of the power 3 for elliptic equations with negative exponents. Calc. Var. Partial Differential Equations 49 (2014), no. 3-4, 909–922.
[6] Duanzhi Zhang, Symmetric period solutions with prescribed minimal period for even autonomous semipositive Hamiltonian systems. Sci. China Math. 57 (2014), no. 1, 81–96.
[7] Duanzhi Zhang and Chungen Liu, Multiplicity of brake orbits on compact convex symmetric reversible hypersurfaces in R2n for n≥ 4. Proc. London Math. Soc. （3）107（2013）1-38.
[8] Duanzhi Zhang, $P$ -cyclic symmetric closed characteristics on compact convex $P$ -cyclic symmetric hypersurface in $\bold R^{2n}$ . Discrete Contin. Dyn. Syst. 33 (2013), no. 2, 947–964.
[9] Duanzhi Zhang, Brake type closed characteristics on reversible compact convex hypersurfaces in $\bold R^{2n}$R2n. Nonlinear Anal.74 (2011), no. 10, 3149–3158.
[10] Duanzhi Zhang and Chungen Liu, Brake orbits in bounded convex symmetric domains. Progress in variational methods, 71–89, Nankai Ser. Pure Appl. Math. Theoret. Phys., 7, World Sci. Publ., Hackensack, NJ, 2011。
[11] Duanzhi Zhang, Relative Morse index and multiple brake orbits of asymptotically linear Hamiltonian systems in the presence of symmetries. J. Differential Equations245 (2008), no. 4, 925–938.
[12] Duanzhi Zhang, Maslov-type index and brake orbits in nonlinear Hamiltonian systems. Sci. China Ser. A50 (2007), no. 6, 761–772.
[13] Duanzhi Zhang, Multiple symmetric brake orbits in bounded convex symmetric domains. Adv. Nonlinear Stud.6 (2006), no. 4, 643–652.
[14] Yiming Long, Duanzhi Zhang and Chaofeng Zhu, Multiple brake orbits in bounded convex symmetric domains. Adv. Math.203 (2006), no. 2, 568–635.
[15] Duanzhi Zhang, Multiple brake orbits on convex hypersurfaces under asymmetric pinch conditions. Nonlinear Anal.61 (2005), no. 6, 919–929.