The action-minimizing problem with free boundaries for the n-body problem. Proceedings of the International Congress of Chinese Mathematicians, Vol III, 269-282, 2007.

Collision-free equivariant minimizers for the n-body problem without equal-mass constraint. Proceedings of the 13th Workshop on Differential Equations, Chiayi, 165-178, 2005.

What can calculus of variations do for the N-body problem?Proceedings of the 12th Workshop on Differential Equations, Hsinchu, 27-38, 2004.

Variational constructions for some satellite orbits in periodic gravitational force fields.Amer. J. Math., in press.

On action-minimizing retrograde and prograde orbits of the three-body problem (with Y.-C.Lin), Comm. Math. Phys., in press.

Existence and minimizing properties of retrograde orbits to the three-body problem with various choices of masses. Annals of Math., 167 (2008), 325-348.

Removing collision singularities from action minimizers for the n-body problem with free boundaries. Arch. Rational Mech. Anal. 181 (2006), 311-331.

Binary decompositions for planar N-body problems and symmetric periodic solutions. Arch. Rational Mech. Anal.170 (2003), 247-276.

Variational methods on periodic and quasi-periodic solutions for the N-body problem. Ergodic Theory & Dynam. Systems23 (2003), 1691-1715.

Action-minimizing orbits in the parallelogram four-body problem with equal masses. Arch. Rational Mech. Anal.158 (2001), 293-318.

On Chenciner-Montgomery^{,}s orbit in the three-body problem. Discrete Contin. Dynam. Systems7 (2001), 85-90.

Symmetry of positive solutions of semilinear elliptic equations in infinite strip domains (with K.J. Chen, H.C. Wang). J. Differential Equations 148 (1998), 1-8.