Zaimi, M., M. N. Azran, M. S. Kasim, M. R. M. Kamal, I. S. Othman, K. T. Lau, T. D. Widodo, and A. H. Sofian. “Effect of Heat Treatment on the Tribological Performance of Electroless Quaternary Nickel Alloy”. Journal of Mechanical Engineering and Sciences, vol. 13, no. 3, Sept. 2019, pp. 5637-52, doi:10.15282/jmes.13.3.2019.26.0452.