Bekker, R. A.; Popkova, V. Ya.; Snegirev, V. G.; Knunyants, I. L.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 3 p. 560 - 564
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 3 p. 621 - 625