Nurgatin, V. V.; Sharnin, G. P.; Nurgatina, R. B.; Ginzburg, B. M. Journal of Organic Chemistry USSR (English Translation), 1985 , vol. 21, # 2 p. 306 - 309 Zhurnal Organicheskoi Khimii, 1985 , vol. 21, # 2 p. 341 - 345