Nikishin, G. I.; Elinson, M. N.; Fedukovich, S. K. Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, # 8 p. 1749 - 1750 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 8 p. 1919 - 1920