Kurniasih E, Rahmi R, Supardan MD, Darusman D. Two-Step Reaction for Biodiesel Synthesized from a High-Free Fatty Acid Crude Palm Kernel Oil. Applied Science and Engineering Progress [internet]. 2025 Apr. 16 [cited 2025 Dec. 7];18(2):7570. available from: https://ph02.tci-thaijo.org/index.php/ijast/article/view/258818