Shipov, A. E.; Genkina, G. K.; Artyushin, O. I.; Mndzhoyan, Z. O.; Gushchin, B. E.; et al.
Russian Chemical Bulletin, 1995 , vol. 44, # 11 p. 2147 - 2156
Izvestiya Akademi Nauk, Seriya Khimicheskaya, 1995 , # 11 p. 2241 - 2249

Kil'disheva,O.V. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1968 , p. 386 - 387
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1968 , p. 398 - 400