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Kahlert, Heike; Meyer, Gabriele; Albrecht, Anja (2016-04-29). "Colour maps of acid–base titrations with colour indicators: how to choose the appropriate indicator and how to estimate the systematic titration errors". ChemTexts. 2 (2). Springer Science and Business Media LLC. डीओआई:10.1007/s40828-016-0026-4. आईएसएसएन2199-3793.