1. (1) K. Ohnishi, M. Shibata, and T. Murakami: “Motion control for advanced mechatronics”, IEEE/ASME Transactions On Mechatronics, Vol. 1, No. 1, pp. 56-67 (1996)
2. (2) T. Murakami, F. Yu, and K. Ohnishi: “Torque sensorless control in multidegree-of-freedom manipulator”, IEEE Transactions on Industrial Electronics, Vol. 40, No. 2, pp. 259-265 (1993)
3. (3) Y. Nagatsu and S. Katsura: “High-order disturbance estimation using Kalman filter for precise reaction-torque control”, Advanced Motion Control, 2004. 8th IEEE International Workshop On, pp. 79-84 (2016)
4. (4) S. Sakaiano, T. Sato, and K. Ohnishi: “Force-based disturbance observer for dynamic force control and a position/force hybrid controller”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 8, No. 5, pp. 505-514 (2013)
5. (5) L. G. Garcia-Valdovinos, V. Parra-Vega, and M. A. Arteaga: “Higher-order sliding mode impedance bilateral teleoperation with robust state estimation under constant unknown time delay”, Proceedings, 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, pp. 1293-1298 (2005)