1. Basmajian, J., & De Luca, C. (1985). Muscles alive: their function revealed by electromyography (p. 1964).
2. Bicchi, A., & Tonietti, G. (2004). Fast and soft arm tactics: dealing with the safety-performance trade-off in robot arms design and control. In IEEE robotics and automation magazine (Vol. 11, pp. 22–33).
3. Bicchi, A., Tonietti, G., Bavaro, M., & Piccigallo, M. (2003). Variable stiffness actuators for fast and safe motion control. In International symposium robotics research (pp. 100–110).
4. Caldwell, D., Medrano-Cerda, G., & Bowler, C. (1997). Investigation of bipedal robot locomotion using pneumatic muscle actuators. In IEEE international conference on robotics and automation (ICRA 1997) (pp. 799–804).
5. Collins, S. H., Ruina, A., Tedrake, R., & Wisse, M. (2005). Efficient bipedal robots based on passive-dynamic walkers. Science, 18(307), 1082–1085.