W. Wan Iskandar Mirza, M. N. B. Abdul Rani, M. Yunus, D. Stancioiu, and V. Shripathi, “Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method”, Int. J. Automot. Mech. Eng., vol. 18, no. 2, pp. 8738 – 8750, Jun. 2021.