Demchuk, D. V.; Lutsenko, A. I.; Troyanskii, E. I.; Nikishin, G. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 8.2 p. 1690 - 1695 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 8 p. 1843 - 1848