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Stephens, B. G., Loftin, J. C., Looney, W. C., & Williams, K. A. (1971). Propylene carbonate extraction of tris(pentan-2,4-dione)-iron(III) from aqueous solution: application to the spectrophotometric determination of iron. The Analyst, 96(1140), 230. doi:10.1039/an9719600230 
10.1039/an9719600230