Dovganyuk, V. F.; Sharf, V. Z.; Saginova, L. G.; Antokol'skaya, I. I.; Bol'shakova, L. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 4 p. 699 - 703 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 4 p. 777 - 782