1. Passive dynamic walking;McGeer;Int. J. Robot. Res.,1990
2. Small slope implies low speed for McGeer’s passive walking machines;Chatterjee;Dyn. Stab. Syst.,2000
3. Collisionless rigid body locomotion models and physically based homotopy methods for finding periodic motions in high degree of freedom models;Gomes,2005
4. An upper-body can improve the stability and efficiency of passive dynamic walking;Chyou;J. Theoret. Biol.,2011
5. D. Ka, Z. Mingguo, X. Wenli, Passive dynamic walking with torso, in: Mechatronics and Automation (ICMA), 2012 International Conference on, 2012, pp. 273–278.