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Hähnel, S., Vlès, F., Cox, A.B. et al. Colorimetrische pH-Bestimmung. Fresenius, Zeitschrift f. anal. Chemie 110, 35–40 (1937). https://doi.org/10.1007/BF01392030
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DOI: https://doi.org/10.1007/BF01392030