Kaplanyan, E. E.; Mkryan, G. G.; Adamyan, A. P.; Mkryan, G. M. Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, # 1 p. 49 - 53 Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 1 p. 55 - 60