Suchuta Naknaka และ Fuangfa Unob. (2014) PURIFICATION OF BIODIESEL BY LIGNITE FLY ASH. Chulalongkorn University:ม.ป.ท.Suchuta Naknaka และ Fuangfa Unob. 2014. PURIFICATION OF BIODIESEL BY LIGNITE FLY ASH. ม.ป.ท.:Chulalongkorn University;Suchuta Naknaka และ Fuangfa Unob. PURIFICATION OF BIODIESEL BY LIGNITE FLY ASH. ม.ป.ท.:Chulalongkorn University, 2014. Print.