Natewong, Paweesuda, Natthawan Prasongthum, Yayoi Murakami, Haruki Tanid, and Kenji Asami. 2016. “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”. American Scientific Research Journal for Engineering, Technology, and Sciences 24 (1): 76-89. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/2032.