Rakpao Ponerattana และ Amorn Petsom. (2007) Viscosity index improving property of low molecular weight polyisoprene from natural rubber in lubricant. Chulalongkorn University:ม.ป.ท.Rakpao Ponerattana และ Amorn Petsom. 2007. Viscosity index improving property of low molecular weight polyisoprene from natural rubber in lubricant. ม.ป.ท.:Chulalongkorn University;Rakpao Ponerattana และ Amorn Petsom. Viscosity index improving property of low molecular weight polyisoprene from natural rubber in lubricant. ม.ป.ท.:Chulalongkorn University, 2007. Print.