Mohamad, Wan Farhana, Amir Azam Khan, Faiz Ahmad, and Abdullah Yassin. 2020. “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 (2), 6548 -56. https://doi.org/10.15282/jmes.14.2.2020.02.0514.