Polivin, Yu. N.; Ageev, E. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 1.2 p. 178 - 180 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 1 p. 195 - 198