Bondarenko, N. A.; Tsvetkov, E. N.; Matrosov, E. I.; Kabachnik, M. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1981 , vol. 30, # 7 p. 1289 - 1293 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1981 , # 7 p. 1596 - 1600