Pharunyou Chanthorn และ Phichet Chaoha. (2014) Extensions of Virtual Stability. Chulalongkorn University:ม.ป.ท.Pharunyou Chanthorn และ Phichet Chaoha. 2014. Extensions of Virtual Stability. ม.ป.ท.:Chulalongkorn University;Pharunyou Chanthorn และ Phichet Chaoha. Extensions of Virtual Stability. ม.ป.ท.:Chulalongkorn University, 2014. Print.