P. Natewong, N. Prasongthum, Y. Murakami, H. Tanid, and K. Asami, “Effect of Addition of CaO and ZrO2 on the Performance of MgO/AC Catalyst for the Synthesis of New Bio-Diesel (HiBD) from Waste Cooking Oil”, ASRJETS-Journal, vol. 24, no. 1, pp. 76–89, Aug. 2016, Accessed: Sep. 12, 2025. [Online]. Available: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/2032