Mkryan, G. M.; Kaplanyan, E. E.; Mkrtchyan, A. M.; Aivazyan, E. M. Journal of Organic Chemistry USSR (English Translation), 1985 , vol. 21, # 2 p. 236 - 239 Zhurnal Organicheskoi Khimii, 1985 , vol. 21, # 2 p. 265 - 268