Finkel'shtein, E. Sh.; Yatsenko, M. S.; Vdovin, V. M. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1982 , vol. 31, # 7 p. 1483 - 1484 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1982 , # 7 p. 1665 - 1666