Worapun, Ittipon, Kulachate Pianthong, Sangobtip Pongstabodee, and Denpong Soodphakdee. 2013. “Performance and Emission Characteristics in Diesel Engine Using Biodiesel from Waste Cooking Oil – Ethanol blend as a Fuel”. Engineering and Applied Science Research 33 (6):691-705. https://ph01.tci-thaijo.org/index.php/easr/article/view/6027.