Kamyshova, A. A.; Chukovskaya, E. Ts.; Freidlina, R. Kh. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, # 8 p. 1643 - 1647 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 8 p. 1795 - 1799