Herzog, A., Righetti, L., Grimminger, F., Pastor, P., & Schaal, S. (2014). Balancing experiments on a torque‐controlled humanoid with hierarchical inverse dynamics. In 2014 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2014) (pp. 981-988). Piscataway, NJ: IEEE. doi:10.1109/IROS.2014.6942678.