Sailah, Illah, Erliza Hambali, and Fadilla Eka Aulyana. 2021. “Formulation of Biodegreaser Made from Palm Oil Methyl Ester Sulfonate Surfactant With Oxalic Acid Additive”. International Journal of Oil Palm 4 (2):39-45. https://doi.org/10.35876/ijop.v4i2.62.