Baram. S. G.; Shkurko, O. P.; Mamaev, V. P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 8 p. 1263 - 1267
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 8 p. 1781 - 1785