Adam, S. A., N. A. A. Jalil, K. A. Md Razali, Y. G. Ng, and M. F. Aladdin. “Mathematical Model of Suspension Seat-Person Exposed to Vertical Vibration for Off-Road Vehicles”. International Journal of Automotive and Mechanical Engineering, vol. 16, no. 2, July 2019, pp. 6773-82, doi:10.15282/ijame.16.2.2019.22.0509.