Cherstkov, V. F.; Postovoi, S. A.; Lantseva, D. T.; Sterlin, S. R.; Zeifman, Yu. V.; German, L. S. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1984 , vol. 33, # 12 p. 2508 - 2511 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1984 , # 12 p. 2740 - 2743