1. G. L. Grigoryan, M. M. Tulyaganov, T. G. Gafurov, A. Adylov, Yu. T. Tashpulatov, and Kh. U. Usmanov, Vysokomol. Soedin., No. 4, 753 (1980).
2. Yu. K. Getmanchuk, I. K. Itskovskaya, and V. N. Staren'kaya, Ukr. Khim. Zh., No. 5, 546 (1976).
3. T. V. Sebast'yan, B. I. Mikhant'ev, V. K. Voinova, and G. V. Shatilov, Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 22, 1071 (1979).
4. K. V. Anan'eva and N. K. Rozhkova, paper deposited at VINITI, No. 239/71. Ref. Zh. Khim., 9zh99 (1972).
5. A. F. Halasa, J. Org. Chem., 38, 1353 (1973).