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Journal of Organic Chemistry USSR (English Translation), 1982 , p. 964 - 965
Zhurnal Organicheskoi Khimii, 1982 , vol. 18, # 5 p. 1113 - 1114
Davies, Alwyn G.; Sutcliffe, Roger
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1981 , p. 1512 - 1519