Bykov, V. I.; Butenko, T. A.; Finkel'shtein, E. Sh. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 1.2 p. 151 - 155 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 1 p. 168 - 171