Kurasov, L. A.; Pozharskii, A. F.; Kuz'menko, V. V.; Klyuev, N. A.; Chernyshev, A. I.; et al. Journal of Organic Chemistry USSR (English Translation), 1983 , vol. 19, p. 520 - 525 Zhurnal Organicheskoi Khimii, 1983 , vol. 19, # 3 p. 590 - 597