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Yamaguchi, K., Tamura, Z. & Maeda, M. Molecular Structure of the Zwitterionic Form of Phenolsulfonphthalein. ANAL. SCI. 13, 521–522 (1997). https://doi.org/10.2116/analsci.13.521
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DOI: https://doi.org/10.2116/analsci.13.521