Sailah, Illah, Erliza Hambali, and Fadilla Eka Aulyana. “Formulation of Biodegreaser Made from Palm Oil Methyl Ester Sulfonate Surfactant With Oxalic Acid Additive”. International Journal of Oil Palm 4, no. 2 (December 15, 2021): 39–45. Accessed September 11, 2025. https://ijop.id/index.php/ijop/article/view/62.