Lapidus, A. L.; Pirozhkov, S. D.; Tumanova, A. R.; Dolidze, A. V.; Yukhimenko, A. M.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 8.2 p. 1672 - 1674
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 8 p. 1885 - 1887