1. Hutchinson, J. and Ledwith, A.: Advances in Polym. Sci. 14, 49 (1974)
2. Tazuka, S. In: High Polymers, Vol. 29, p. 681, Schildknecht, C. E. and Skeist, I. (eds), New York: Wiley Interscience 1977
3. Labana, S. S. In: Revs. in Macromol. Chem., Vol. 12, p. 299, Butler, E. G., O'Driscoll, K. F. and Shen, M., (eds). New York: Dekker 1977
4. Irie, M., Yamamoto, Y. and Hayashi, K.: J. Macromol. Sci.-Chem. A9 (5), 817 (1975)
5. Irie, M., Yamamoto, Y. and Hayashi, K.: Pure and Appl. Chem. 49, 455 (1977)