Natewong, P., Prasongthum, N., Murakami, Y., Tanid, H. and Asami, K. 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 (Aug. 2016), 76–89.