1. (1) H. Seki, K. Ishihara, and S. Tadakuma: “Novel Regenerative Braking Control of Electric Power-Assisted Wheelchair for Safety Downhill Road Driving”, IEEE Trans. on Industrial Electronics, Vol. 56, No. 5, pp. 1393-1400 (2009)
2. (2) S. Katsura and K. Ohnishi: “A Wheelchair Type Mobil Robot Taking Environmental Disturbance into Account Based on Compliance Control”, Institute of Electrical Engineers Journal D, Vol. 122-D, No. 9, pp. 942-947 (2002)
3. (3) G. V. Raffo, V. Madero, and M. G. Ortega: “An Application of the Underactuated Nonlinear H∞ Controller to Two-Wheeled Self-Balanced Vehicles”, Emerging Technologies and Factory Automation (ETFA), IEEE Conference (2010)
4. (4) N. Hirose, K. Sugihara, H. Kajima, and M. Yamaoka: “Mode Switching Control for Personal Mobility Robot”, IEEJ Trans. IA, Vol. 131, No. 9, pp. 1157-1164 (2011)
5. (5) M. T. Ravichandran and A. D. Mahindrakar: “Robust Stabilization of a Class of Underactuated Mechanical Systems Using Time Scaling and Lyapunov Redesign”, IEEE Trans. on Industrial Electronics, Vol. 58, No. 9, pp. 4299-4313 (2011)