Mohd Tumari, M. Z., wan norhisyam abd rashid, a shamsul rahimi a subki, M. A. Kasno, S. Saat, and M. S. Mohd Aras. “Liquid Slosh Suppression Hardware-in-the-Loop System by Implementing PID Model-Free Controller”. International Journal of Electrical Engineering and Applied Sciences (IJEEAS), vol. 3, no. 1, Apr. 2020, pp. 1-6, https://ijeeas.utem.edu.my/ijeeas/article/view/5427.