Zaletov, V. G.; Shiff, A. I.; Ivakhnenko, E. P.; Prokof'ev, A. I. Russian Chemical Bulletin, 1995 , vol. 44, # 5 p. 867 - 872 Izvestiya Akademi Nauk, Seriya Khimicheskaya, 1995 , # 5 p. 894 - 899