Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 28, p. 2057 - 2061
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , vol. 28, # 10 p. 2234 - 2238

Andreev,D.N. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1979 , vol. 28, p. 2057 - 2061
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1979 , vol. 28, # 10 p. 2234 - 2238