Dzhemilev, U. M.; Selimov, F. A.; Tolstikov, G. A.; Galkin, E. A.; Khvostenko, V. I.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 3 p. 473 - 476
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 3 p. 652 - 655