Kholdeeva, O. A.; Kozhevnikov, I.V.; Sidel'nikov, V. N.; Utkin, V. A. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 2 p. 1903 - 1907 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , vol. 9, p. 2069 - 2073