Freimanis, Ya. F.; Dikovskaya, K. I.; Ignatovich, L. G.; Kudryashova, V. V.; Korits, V. R.; et al. Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 1282 - 1289Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 7 p. 1409 - 1417