Lisichkina, I. N.; Vinogradova, A. I.; Saporovskaya, M. B.; Latov, V. K.; Velikov, V. M. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, # 5 p. 1029 - 1031 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 5 p. 1170 - 1172