L. Qadariyah, S. Sahila, and M. Mahfud, “The Effect of Reaction Time and Temperature on the Synthesis of Methyl Ester Sulfonate Surfactant from Palm Oil as a Feedstock using Microwave-Assisted Heating”, ASEAN J. Chem. Eng., vol. 20, no. 2, pp. 104-112, Jun. 2021.