Kuz'mina, N. A.; Zhiryukhina, N. P.; Chukovskaya, E. Ts.; Freidlina, R. Kh. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 9 p. 1715 - 1719 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , vol. 30, # 9 p. 2090 - 2094