Tkachenko, V. V.; Tregub, N. G.; Knyazev, A. P.; Mezheritskii, V. V. Journal of Organic Chemistry USSR (English Translation), 1990 , vol. 26, # 3.2 p. 548 - 556 Zhurnal Organicheskoi Khimii, 1990 , vol. 26, # 3 p. 638 - 649