Dzhemilev, U. M.; Ibragimov, A. G.; Zolotarev, A. P.; Muslukhov, R. R.; Tolstikov, G. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 1.2 p. 194 - 195 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , vol. 38, # 1 p. 207 - 208