Md. Sam, Y., Ishak, N. K., Othman, R. S. E. R. A., Ahmad, A., & Basari, A. A. (2009). An observer design of nonlinear quarter car model for active suspension system by using backstepping controller. Institute of Electrical and Electronics Engineers.

Md. Sam, Yahaya, Nor Khomar Ishak, Radiah S. E. R. A. Othman, A. Ahmad, and Amat Amir Basari. An Observer Design of Nonlinear Quarter Car Model for Active Suspension System By Using Backstepping Controller. Institute of Electrical and Electronics Engineers, 2009.

Md. Sam, Yahaya, et al. An Observer Design of Nonlinear Quarter Car Model for Active Suspension System By Using Backstepping Controller. Institute of Electrical and Electronics Engineers, 2009.