Piyachai Khomein และ Varawut Tangpasuthadol. (2011) Synthesis of positively-charged poly(lactic acid). Chulalongkorn University:ม.ป.ท.Piyachai Khomein และ Varawut Tangpasuthadol. 2011. Synthesis of positively-charged poly(lactic acid). ม.ป.ท.:Chulalongkorn University;Piyachai Khomein และ Varawut Tangpasuthadol. Synthesis of positively-charged poly(lactic acid). ม.ป.ท.:Chulalongkorn University, 2011. Print.