Step, E. N.; Tarasov, V. F.; Buchachenko, A. L. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1988 , vol. 37, # 10 p. 2024 - 2028 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1988 , # 10 p. 2250 - 2255