Akhrem, I. S.; Orlinkov, A. V.; Mysov, E. I.; Enaleeva, R. Ya.; Vol'pin, M. E. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1983 , vol. 32, # 8 p. 1748 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1983 , # 8 p. 1925