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T. H. Easterfield and W. J. Sell
LXXXIV.—Anhydro-derivatives of citric and aconitic acids
Journal of the Chemical Society, Transactions
1892, 61, 1003 - 1012,
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http://dx.doi.org/10.1039/CT8926101003Norman Bland and Jocelyn Field Thorpe
CLX.—The chemistry of the aconitic acids. Part I. The labile modification of aconitic acid and the hydroxy-anhydro-acid
Journal of the Chemical Society, Transactions
1912, 101, 1490 - 1498,
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http://dx.doi.org/10.1039/CT9120101490