1. Paul DR (1969) J. Appl. Polym. Sci. 13: 817
2. Roychen J, Surekha D, Animesh KR (1991) Polym. Int. 26: 89
3. Thorne DJ (1970) J. Appl. Polym. Sci. 14: 103
4. Wen-Li Chou, Ming-Chien Yang (2005) Polym. Adv. Technol. 16: 525
5. Chen Hou, Rong-jun Qu, Ying Liang, Cheng-guo Wang (2005) J. Appl. Polym. Sci. 96: 1532