1. Ding, D., Cooper, R. A., Terashima, S., Yang, Y. S. and Cooper, R., A study on the balance function of the iBOT transporter, In Proceedings of the RESNA 2004 annual conference, (2004).
2. Fang, L., Lu, T., He, W. and Yuan, K., Dynamic and tip-over stability analysis of a planetary wheeled stair-climbing wheelchair, International Conference on Mechatronics and Automation (ICMA) (2012), pp.2541-2546.
3. Gonzalez, A., Ottaviano, E. and Ceccarelli, M., On the kinematic functionality of a four-bar based mechanism for guiding wheels in climbing steps and obstacles. Mechanism and Machine Theory, Vol.44, No.8 (2009), pp.1507-1523.
4. Hirose, S., Fukushima, E. F., Damoto, R. and Nakamoto, H., Design of terrain adaptive versatile crawler vehicle HELIOS-VI, Intelligent Robots and Systems, Proceedings of IEEE/RSJ International Conference, Vol. 3, pp.1540-1545.
5. Jing-Yi, L. I., Yang, B., Fei, J., Wang, D. X. and Gao, X. S., Mechanics analysis of a wheelchair robot with wheel-track coupling mechanism. Journal of Beijing Institute of Technology, Vol.22, No.3 (2013), pp.301-307.