Keiko,N.A. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1977 , vol. 26, p. 1522 - 1524
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1977 , vol. 26, p. 1652 - 1655

Keiko,N.A. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1977 , vol. 26, p. 1522 - 1524
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1977 , vol. 26, p. 1652 - 1655