Puzin, Yu. I.; Leplyanin, G. V.; Rafikov, S. R. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1984 , vol. 33, p. 1892 - 1895 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1984 , # 9 p. 2073 - 2076