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It is thus possible to select an indicator for a particular purpose with considerable accuracy. Salm, E., A Study of Indicators, !Z. physik. Chem.!, 57 , 471-501. Stieglitz, J., Theories of Indicators, !J. Am. Chem. Soc.!, 25 , 1112-1127. Chem. Soc.!, 32 , 815-861. Bjerrum, N., General Discussion, !Z. Anal. Chem.!, 66 , 13-28 and 81-95. Ostwald, W., Colloid Chemistry of Indicators, !Z. Chem. Ind.
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