Rybin, L. I.; Gendin, D. V.; Vyazankina, O. A.; Vyazankin, N. S.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, p. 1520 - 1522
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 7 p. 1672 - 1674