Tippawan Kowitteerawut. (1997) A study of structure-properties of purified natural rubber. Mahidol University,:ม.ป.ท.Tippawan Kowitteerawut. 1997. A study of structure-properties of purified natural rubber. ม.ป.ท.:Mahidol University,;Tippawan Kowitteerawut. A study of structure-properties of purified natural rubber. ม.ป.ท.:Mahidol University, 1997. Print.