Vovk, M. V.; Dorokhov, V. I.; Samarai, L. I. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 6 p. 1113 - 1116 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 6 p. 1237 - 1240