Chiew, T.; Jamaludin, Z.; Bani Hashim, A.; Abdullah, L.; Rafan, N.; Maharof, M. Second Order Sliding Mode Control for Direct Drive Positioning System. J. Mech. Eng. Sci. 2017, 11 (4), 3206-3216. https://doi.org/10.15282/jmes.11.4.2017.23.0289.