Anguladze, M. K.; Kaplun, A. P.; Shvets, V. I.
Journal of Organic Chemistry USSR (English Translation), 1981 , vol. 17, # 11 p. 2075 - 2080
Zhurnal Organicheskoi Khimii, 1981 , vol. 17, # 11 p. 2323 - 2329