1. (1) T. Umeno, T. Kaneko, and Y. Hori: “Robust servosystem design with two degrees of freedom and its application to novel motion control of robot manipulators”, IEEE Transactions on Industrial Electronics, Vol. 40, No. 5, pp. 473-485 (1993)
2. (2) S. Komada, N. Machii, and T. Hori: “Control of redundant manipulators considering order of disturbance observer”, IEEE Transactions on Industrial Electronics, Vol. 47, No. 2, pp. 413-420 (2000)
3. (3) F. Yu, T. Murakami, and K. Ohnishi: “Sensorless force control of direct drive manipulator”, In [1992] Proceedings of the IEEE International Symposium on Industrial Electronics, Vol. 1, pp. 311-315 (1992)
4. (4) A. Suzuki: “Application of decoupling hybrid control for cold rolling mill with disturbance observer”, In IECON 2015-41st Annual Conference of the IEEE Industrial Electronics Society, pp. 000875-000880 (2015)
5. (5) K. Ohishi, S. Kadowaki, Y. Smizu, T. Sano, S. Yasukawa, and T. Koseki: “Anti-slip readhesion control of electric commuter train based on disturbance observer considering bogie dynamics”, In IECON 2006-32nd Annual Conference on IEEE Industrial Electronics, pp. 5270-5275 (2006)