Vasil'eva, T. P.; Bystrova, V. M.; Lin'kova, M. G.; Kil'disheva, O. V.; Knunyants, I. L. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 7 p. 1324 - 1326 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , # 7 p. 1633 - 1636