Sinyashina, T. N.; Mironov, V. F.; Ofitserov, E. N.; Konovalova, I. V.; Pudovik, A. N. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, # 6 p. 1287 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 6 p. 1451