[1]       Hou X.Y., Liu L., the symmetric horseshoe periodic families and the Lyapunov planar family around L3, the Astronomical Journal, 2008, 136, 67-75
[2]       Hou X.Y., Liu L., vertical bifurcation families from the long and short period families around the equilateral equilibrium points, Celestial Mechanics and Dynamical Astronomy, 2008, 101, 309-320
[3]       Hou X.Y., Liu L., on quasi-periodic motions around the triangular libration points of the real Earth-Moon system, Celestial Mechanics and Dynamical Astronomy, 2010, 108: 301-313;
[4]       Hou X.Y., Liu L., on motions around the collinear libration points in the elliptic restricted three-body problem, Monthly Notice of the Royal Astronomical Society, 2011, 415, 3552-3560
[5]       Hou X.Y., Scheeres D.J., Liu L., Saturn Trojans: a dynamical point of view, Monthly Notice of the Royal Astronomical Society, 2014, 437, 1420-1433
[6]       Hou X.Y., Scheeres D.J., Liu L., dynamics of the Jupiter Trojans with Saturn’s perturbation in the present configuration of the two planets, Celestial Mechanics and Dynamical Astronomy, 2014, 119, 119-142
[7]       Hou X.Y., Scheeres D.J., Liu L., stable motions around triangular libration points in the real Earth-Moon system, Mon. Not. R. Astron. Soc., 2015, 454, 4172-4181