Buasri, Achanai, Suthita Lertnimit, Arnon Nisapruksachart, Issara Khunkha, and Vorrada Loryuenyong. “Box-Behnken Design for Optimization on Esterification of Free Fatty Acids in Waste Cooking Oil Using Modified Smectite Clay Catalyst”. ASEAN Journal of Chemical Engineering 23, no. 1 (June 30, 2023): 40-51. Accessed November 6, 2024. https://dev.journal.ugm.ac.id/v3/AJChE/article/view/9270.