Stankevich, A. I.; Zyat'kov, I. P.; Lazareva, A. M.; El'nitskii, A. P. Journal of Organic Chemistry USSR (English Translation), 1980 , vol. 16, p. 1543 - 1548 Zhurnal Organicheskoi Khimii, 1980 , vol. 16, # 9 p. 1823 - 1829