1. A.M. Bloch, N.E. Leonard, J.E. Marsden, Stabilization of mechanical systems using controlled Lagrangians, in Proceedings of IEEE International Conference on Decision and Control, 1997, pp. 2356–2361
2. A.M. Bloch, J.E. Marsden, G.S. de Alvarez, Feedback stabilization of mechanical systems with symmetry, in Current and Future Directions in Applied Mathematics, ed. by M. Alber, B. Hu, J. Rosenthal (Birkhäuser, Boston, 1997), pp. 43–64
3. A.M. Bloch, N.E. Leonard, J.E. Marsden, Matching and stabilization by the method of controlled Lagrangians, in Proceedings of IEEE International Conference on Decision and Control, 1998, pp. 1446–1451
4. M.J. Coleman, A. Ruina, An uncontrolled walking toy that cannot stand still. Phys. Rev. Lett. 80(16), 3658–3661 (1998)
5. S. Collins, A. Ruina, R. Tedrake, M. Wisse, Efficient bipedal robots based on passivity-dynamic walkers. Science 307(5712), 1082–1085 (2005)