Maier, V. E.; Kitaigorodskii, A. N.; Khannanov, N. K.; Shafirovich, V. Ya. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1987 , vol. 36, # 11 p. 2281 - 2286 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1987 , # 11 p. 2458 - 2463