1. McGeer, T.: Passive dynamic walking. Int. J. Robot. Res. 9(2), 62–82 (1990)
2. McGeer, T.: Passive walking with knees. In: IEEE International Conference on Robotics and Automation, pp. 1640–1645 (1990)
3. Collins, S.H., Ruina, A.: A bipedal walking robot with efficient and human-like gait. In: IEEE International Conference on Robotics and Automation, pp. 1983–1988 (2005)
4. Tedrake, R., Zhang, T.W., Fong, M., Seung, H.S.: Actuating a simple 3D passive dynamic walker. In: IEEE International Conference on Robotics and Automation, pp. 4656–4661 (2004)
5. Hobbelen, D.G.E., Wisse, M.: A disturbance rejection measure for limit cycle walkers: the gait sensitivity norm. IEEE Trans. 23(6), 1213–1224 (2007)