Harinate Mungpayaban และ Somchai Pengprecha. (2006) Improvement of lubricity of sulfonated methyl ester from vegetable oil soapstocks. Chulalongkorn University:ม.ป.ท.Harinate Mungpayaban และ Somchai Pengprecha. 2006. Improvement of lubricity of sulfonated methyl ester from vegetable oil soapstocks. ม.ป.ท.:Chulalongkorn University;Harinate Mungpayaban และ Somchai Pengprecha. Improvement of lubricity of sulfonated methyl ester from vegetable oil soapstocks. ม.ป.ท.:Chulalongkorn University, 2006. Print.