Kadyrov, A. A.; Rokhlin, E. M.; Knunyats, I. L. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 11 p. 2210 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , # 11 p. 2653