Knunyants, I. L.; Postovoi, S. A.; Delyagina, N. I.; Zeifman, Yu. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1987 , vol. 36, # 10 p. 2090 - 2095 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1987 , # 10 p. 2256 - 2261