Zhun', V. I.; Tsvetkov, A. L.; Bochkarev, V. N.; Slyusarenko, T. F.; Turkel'taub, G. N.; Sheludyakov, V. D.
J. Gen. Chem. USSR (Engl. Transl.), 1989 , vol. 59, # 2.2 p. 390 - 395,344 - 348

Lindner, Ekkchard; Brugger, Stefan; Steinbrecher, Stefan; Plies, Erich; Mayer, Hermann A.
Journal of Materials Chemistry, 2001 , vol. 11, # 5 p. 1393 - 1401

Vdovin,V.M. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1961 , p. 1185 - 1189
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1961 , # 7 p. 1275 - 1279