Vasil'eva, T. T.; Germanova, L. F.; Nelyubin, B. V.; Freidlina, R. Kh. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, # 2 p. 347 - 349 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 2 p. 376 - 378