Ibragimov, A. G.; Minsker, D. L.; Saraev, R. A.; Dzhemilev, U. M. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 10 p. 2104 - 2107 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 10 p. 2333 - 2336