M. M. Mahat, F. N. Kazwa, S. Kasolang, N. N. Mohd Kamaldin, and S. Shawal, “Tribological Characterisation of Biofluid using Four Ball Experiment”, J. Adv. Res. Appl. Sci. Eng. Tech., vol. 65, no. 1, pp. 122–137, Mar. 2025.