N. N. Saimon, Z. H. Hassan, M. Jusoh, N. Ngadi, M. A. Ab Aziz, and Z. Y. Zakaria, “Characterization of Microwave-Assisted Sulfonated Glucose Catalyst for Esterification of Palm Fatty Acid Distillate to Biodiesel”, Chemical Engineering Transactions, vol. 72, pp. 373-378, Jan. 2019.