1. A.L. Buchachenko, J.Polym.Sci., Symp. 57 (1976) 299.
2. D.E. Vansiokle, J.Polym.Sci. A-1, 10 (1972) 355.
3. A.B. Mathur, A.K. Nagpal, Vijai Kumar and G.N. Mathur, Ind.J.Technol., In Press.
4. J. Holctk, M. Kosik, J.Polym.Sci.Symp. 57 (1976) 191.
5. I. Buhen and J. Pospisil, J.Polym.Sci.Symp. 57 (1976)255.