1. V. G. Yakutovich, B. L. Moldaver, Yu. P. Kitaev, and Z. S. Titova, Izv. AN SSSR, Ser. Khim., 2086 (1970).
2. B. L. Moldaver, M. E. Aronzon, and M. P. Papirnik, Khim. Geterotsikl. Soedin., 407 (1970).
3. B. L. Moldaver and M. E. Aronzon, Khim. Geterotsikl. Soedin., 804 (1970).
4. B. L. Moldaver, M. E. Aronzon, and M. P. Papirnik, Materials of the Scientific Conference Devoted to the 50th Anniversary of the Great October Socialist Revolution in Leningrad [in Russian], LKhFI (1967), p. 85.
5. T. T. Tsumaki, Bull. Chem. Soc. Japan,6, 1 (1931).