Murzina, L. T.; Baires, S. V.; Nekhoroshkov, V. M.; Ivanov, B. E. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1991 , vol. 40, # 7.2 p. 1514 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1991 , # 7 p. 1705