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2. 2) Ishihara H, Seikei-Kakou, 23, 336 (2011) in Japanese.
3. 3) Ishihara H, Seikei-Kakou, 23, 430 (2011) in Japanese.
4. 4) Kase S, Matsuo T, J Polym Sci Part A, 3, 2541 (1965).
5. 5) Kase S, Matsuo T, J Polym Sci Part A, 11, 251 (1967).