Vdovin, V. M.; Finkel'shtein, E. Sh.; Shelkov, A. V.; Yatsenko, M. S. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, # 11 p. 2364 - 2366 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 11 p. 2578 - 2580