Voronkov, M. G.; Toryashinova, D-S. D.; Baryshok, V. P.; Shainyan, B. A.; Brodskaya, E. I. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1984 , vol. 33, # 12 p. 2447 - 2450 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1984 , # 12 p. 2673 - 2676