S. Kajita, F. Kanehiro, K. Kaneko, K. Yokoi, and H. Hirukawa, The 3D linear inverted pendulum mode: a simple modeling for a biped walking pattern generation, Proceedings 2001 IEEE/RSJ International Conference on Intelligent Robots and Systems. Expanding the Societal Role of Robotics in the the Next Millennium (Cat. No.01CH37180), pp.239-246, 2001.
DOI : 10.1109/IROS.2001.973365

S. Kajita, T. Yamaura, and A. Kobayashi, Dynamic walking control of a biped robot along a potential energy conserving orbit, IEEE Transactions on Robotics and Automation, vol.8, issue.4, pp.431-438, 1992.
DOI : 10.1109/70.149940

H. Razavi, A. M. Bloch, C. Chevallereau, and J. W. Grizzle, Restricted discrete invariance and self-synchronization for stable walking of bipedal robots, 2015 American Control Conference (ACC), pp.4818-4824, 2015.
DOI : 10.1109/ACC.2015.7172088

, Symmetry in legged locomotion: a new method for designing stable periodic gaits, Autonomous Robots, vol.41, issue.5, pp.1119-1142, 2017.