Semenova,N.V.; Komarov,N.V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1972 , vol. 21, p. 177 - 179
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1972 , vol. 21, p. 185 - 187