M, R., J. Valder, and A. O. Surendranathan. “Determination of Friction Factor by Ring Compression Test for Al-5Zn-1Mg Using Graphite and MoS2 Lubricants”. Science & Technology Asia, vol. 17, no. 3, Oct. 2015, pp. 13-19, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41171.