Nuretdinova,O.N.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1978 , vol. 27, p. 1669 - 1673
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1978 , vol. 27, # 8 p. 1898 - 1902