Zeifman, Yu. V.; Lantseva, L. T.; Postovoi, S. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 7 p. 1350 - 1352 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , # 7 p. 1661 - 1663