Kalinin, A. V.; Apasov, E. T.; Ioffe, S. L.; Tartakovskii, V. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 5.1 p. 988 - 995 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 5 p. 1108 - 1114