Arshinova, R.P.; Kadyrov, R.A.; Klochkov, V.V.; Aganov, A.V.; Shakirov, I.Kh.; et al. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1984 , vol. 33, # 11 p. 2301 - 2305 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1984 , # 11 p. 2512 - 2517