Zakharkin, L. I.; Zhigareva, G. G.; Petrushkina, E. A.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 9 p. 1750 - 1752
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , vol. 30, # 9 p. 2131 - 2132