Mirskova, A. N.; Levkovskaya, G. G.; Gogoberidze, I. T.; Kalikhman, I. D.; Voronkov, M. G. Journal of Organic Chemistry USSR (English Translation), 1985 , vol. 21, # l p. 239 - 241 Zhurnal Organicheskoi Khimii, 1985 , vol. 21, # 2 p. 269 - 271