Yusuf, N.K., et al. “Life Cycle Assessment on the Direct Recycling Aluminium Alloy AA6061 Chips and Metal Matrix Composite (MMC-AlR)”. International Journal of Integrated Engineering, vol. 13, no. 7, Sept. 2021, pp. 95-100, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/7437.