Robert D. Gregg , Mark W. Spong. Reduction-based Control with Application to Three-Dimensional Bipedal Walking Robots[C]. American Control Conference, Seattle, 2008：880-887 [2] Arthur D. Kuo. Stabilization of Lateral Motion in Passive Dynamic Walking[J], The International Journal of Robotics Research, 1999, 18(9): 917-930. [3]绳涛，王剑，马宏绪。欠驱动两足步行机器人侧向稳定控制方法研究[J].计算机工程与应用，2008,44（3）：1-4 （Sheng Tao,Wang Jian,Ma Hong-xu.Lateral stabilization control of underactuated biped robot [J].computer engineering and application, 2008,44（3）：1-4） [4]Aaron D.Ames,Ryan W. Sinnet,Eric D.B Wendel.Three-Dimensional Kneed Bipedal Walking:A Hybrid Geometric Approach[J]. Computation and Control ,2009 :16-30 [5]刘振泽, 田彦涛, 张佩杰, 等. 无动力双足步行机器人控制策略与算法[J]. 控制理论与应用, 2009, 26(2): 113-121. （Liu Z Z, Tian Y T, Zhang P J, et al. Control strategies and algorithms for passive compass-like biped robot[J]. Control Theory and Applications, 2009, 26(2): 113-121.） [6]Aaron D.Ames, Robert D. Gregg. Stably Extending Two-Dimensional Bipedal Walking to Three Dimensions[C].proceeding of the 2007 American control conference,USA,2007:2848-2854 [7]Ames, Aaron D. and Gregg, Robert D. and Spong, Mark W.A geometric approach to three-dimensional hipped bipedal robotic walking. 46th IEEE Conference on Decision and Control, Piscataway, 200:,5348-5355 [8]Aaron D. Ames, Robert D. Gregg, Eric D. B. Wendel etc.On the Geometric Reduction of ControlledThree-Dimensional Bipedal Robotic Walkers[J].Lagrangian and Hamiltonian Methods for Nonlinear Control，Berlin, 2007： 183-196. [9] Petri T. Piiroinen, Harry J. Dankowicz, Arne B. Nordmark. Breaking Symmetries and Constraints:Transitions from 2D to 3D in Passive Walkers[J]. Multibody system Dynamics,2003,10:147-176 [10] Jessy W. Grizzle, Eric R. Westervelt. Hybrid zero dynamics of planar biped walkers[J]. IEEE Transactions on Automatic Control, 2003，（48）：42 – 56
