Hafiz, A. and Ibrahim, S.A. (2024) “Effect of Varied Degumming Concentrations on Soap from Used Cooking Oil”, Research Progress in Mechanical and Manufacturing Engineering, 5(1), pp. 435–443. Available at: https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/15793 (Accessed: 12 March 2026).