Mohamad, Wan Farhana, Amir Azam Khan, Faiz Ahmad, and Abdullah Yassin. “Phase Analysis and Microstructure Study of Sintered Ni-Cr Composites Containing MoS2, Ag and CaF2 Additives As Solid Lubricants”. Journal of Mechanical Engineering and Sciences 14, no. 2 (June 22, 2020): 6548–6556. Accessed August 13, 2022. https://journal.ump.edu.my/jmes/article/view/1749.