W.C. Yan, M.N. Masri, N.S. Alias, M. Mohamed, M. Yusoff and S. Mamat. “Graphene As Possible Reinforcement in Brass Material: A Short Overview”. International Journal of Advanced Science and Technology, Vol. 29, no. 9s, May 2020, pp. 6102 -07, http://sersc.org/journals/index.php/IJAST/article/view/19284.