Ishak, N. N. M., M. S. Salleh, S. H. Yahaya, E. Mohamad, and M. A. Sulaiman. “The Effect of Equal Channel Angular Pressing (ECAP) on the Microstructure and Hardness of A356 Aluminium Alloy”. Journal of Advanced Manufacturing Technology (JAMT), Vol. 11, no. 2, Dec. 2017, pp. 47-58, https://jamt.utem.edu.my/jamt/article/view/1959.