Olifirov, D. I.; Koshchii, V. A.; Kozlikovskii, Ya. B. Journal of Organic Chemistry USSR (English Translation), 1992 , vol. 28, # 1 p. 152 - 157 Zhurnal Organicheskoi Khimii, 1992 , vol. 28, # 1 p. 182 - 187