Yupaporn Rodthong และ Wimonrat Trakarnpruk. (2007) Preparation of open cell sponge rubber for printing application. Chulalongkorn University:ม.ป.ท.Yupaporn Rodthong และ Wimonrat Trakarnpruk. 2007. Preparation of open cell sponge rubber for printing application. ม.ป.ท.:Chulalongkorn University;Yupaporn Rodthong และ Wimonrat Trakarnpruk. Preparation of open cell sponge rubber for printing application. ม.ป.ท.:Chulalongkorn University, 2007. Print.