Nikulin, V. I.; Pisarenko, L. M. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, # 1 p. 141 - 144 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 1 p. 151 - 155