Del'tsova, D. P.; Zeifman, Yu. V.; Gambaryan, N. P. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, # 11 p. 2345 - 2350 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 11 p. 2533 - 2537