Bekker, R. A.; Rozov, L. A.; Popkova, V. Ya.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 11 p. 2317 - 2322
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 11 p. 2575 - 2581