Sokolov, V. B.; Ivanov, A. N.; Epishina, T. A.; Martynov, I. V. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1989 , vol. 38, # 6.2 p. 1296 - 1298 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1989 , # 6 p. 1416 - 1418