1. C.D. Han, C. Sanford and H.J. Yoo, Polym.Eng.Sci., 18, 849 (1978)
2. Plastic Additives Handbook, eds.R.Gachter and H.Muller, Hanser Pub., Munich, Vienna, New York, 1984
3. K. Mitsuishi, S. Kodama and H. Kawasaki, Polym.Eng.Sci., 25, 1069 (1985)
4. R. Kalinski, A. Galeski and M. Kryszewski, J.Appl.Polym.Sci., 25, 3982 (1981)
5. B.M. Badran, A. Galeski and M. Kryszewski, J.Appl.Polym.Sci., 26, 3669 (1982)