Vasilevskii, S. F.; Pozdnyakov, A. V.; Shvartsberg, M. S. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, # 6 p. 1250 - 1253 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , # 6 p. 1367 - 1370