Tsvetkov, E. N.; Kron, T. E.; Kabachnik, M. I.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 3 p. 491 - 494
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 3 p. 669 - 672

Tsvetkov,E.N. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1979 , vol. 28, p. 1722 - 1726
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1979 , vol. 28, # 8 p. 1859 - 1862

Tsvetkov,E.N. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1979 , vol. 28, p. 1722 - 1726
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1979 , vol. 28, # 8 p. 1859 - 1862