Arbuzov, B. A.; Ionkin, A. S.; Ignat'eva, S. N.; Efremov, Yu. Ya.; Nekhoroshkov, V. M. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 10 p. 2191 - 2192 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 10 p. 2381 - 2382