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Shastin, A. V. Balenkova, E. S. Sorokin, V. D. Koz'min, A. S. Zefirov, N. S. Journal of Organic Chemistry USSR (English Translation), 1986 , p. 1039 - 1045 Zhurnal Organicheskoi Khimii, 1986 , vol. 22, # 6 p. 1156 - 1163