Andguladze, M. K.; Kaplun, A. P.; Kulish, M. A.; Shvets, V. I. Journal of Organic Chemistry USSR (English Translation), 1983 , vol. 19, p. 846 - 851 Zhurnal Organicheskoi Khimii, 1983 , vol. 19, # 5 p. 954 - 961