Ali, Muhammad Akram Hakimi, et al. “The Combination of a Previous Kitchen Waste Grease Trap for Fat, Oil, and Grease for Pre-Treatment”. Journal of Advancement in Environmental Solution and Resource Recovery, vol. 2, no. 2, Dec. 2022, pp. 37-43, https://publisher.uthm.edu.my/ojs/index.php/jaesrr/article/view/12664.