Nipaporn Suparattadet และ Nuanphun Chantarasiri. (2005) Synthesis of polyureas and polyurethanes containing heterocycles. Chulalongkorn University:ม.ป.ท.Nipaporn Suparattadet และ Nuanphun Chantarasiri. 2005. Synthesis of polyureas and polyurethanes containing heterocycles. ม.ป.ท.:Chulalongkorn University;Nipaporn Suparattadet และ Nuanphun Chantarasiri. Synthesis of polyureas and polyurethanes containing heterocycles. ม.ป.ท.:Chulalongkorn University, 2005. Print.