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Akhachinskaya, T. V. Donskaya, N. A. Kalyakina, I. V. Oprunenko, Yu. F. Shabarov, Yu. S. Journal of Organic Chemistry USSR (English Translation), 989 , vol. 25, # 8. p. 485 - 489 Zhurnal Organicheskoi Khimii, 989 , vol. 25, # 8 p. 645 - 65