Simonyan, L. A.; Safronova, Z. V.; Gambaryan, N. P.; Antipin, M. Yu.; Struchkov, Yu. T. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1980 , vol. 29, # 2 p. 272 - 277 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1980 , # 2 p. 358 - 364