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Tschopp, E., Tschopp, E., Fiske, C.H. et al. Colorimetrische Phosphorsäurebestimmung. Fresenius, Zeitschrift f. anal. Chemie 103, 49–58 (1935). https://doi.org/10.1007/BF01405027
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DOI: https://doi.org/10.1007/BF01405027