Piyawat Paengphua และ Duangamol Tungasmita. (2011) Preparation of polyol esters using acidic heterogeneous catalysts. Chulalongkorn University:ม.ป.ท.Piyawat Paengphua และ Duangamol Tungasmita. 2011. Preparation of polyol esters using acidic heterogeneous catalysts. ม.ป.ท.:Chulalongkorn University;Piyawat Paengphua และ Duangamol Tungasmita. Preparation of polyol esters using acidic heterogeneous catalysts. ม.ป.ท.:Chulalongkorn University, 2011. Print.