Sabirov, S. S.; Gnevasheva, L. M.; Ismailov, M. I.; Isobaev, M. D. Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 1239 - 1243 Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 7 p. 1362 - 1366