Luk'yanov, O.A.; Pokhvisneva, G.V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 11 p. 2217 - 2221 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 11 p. 2540 - 2544