1. M. Kaneko, M. Abe, and S. Tachi, “Basic considerations on degrees of freedom of multi-legged locomotion machines,” Journal of the Robotics Society of Japan, Vol. 2, No. 2, pp. 142–150, 1984.
2. M. Buehler, A. Cocosco, K. Yamazaki, and R. Battaglia, “Stable open loop walking in quadruped robots with stick legs,” in IEEE International Conference on Robotics and Automation, pp. 2348–2353, 1999.
3. M. Buehler, R. Battaglia, A. Cocosco, G. Hawker, J. Sarkis, and K. Yamazaki, “SCOUT: A simple quadruped that walks, climbs, and runs,” in International Conference on Robotics and Automation, pp. 1707–1712, 1998.
4. I. Poulakakis, E. Papadopoulos, and M. Buehler, “On the stable passive dynamics of quadrupedal running,” in International Conference on Robotics and Automation, pp. 1368–1373, 2003.
5. K. Iida, Y. Hayami, T. Hira, T. Yasuno, and T. Kamano, “Evolutionary acquisition for moving performance of reduced DOF’s quadruped robot,” in SICE-ICASE International Joint Conference, pp. 3005–3010, 2006.