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Ruggli, P., Fischli, A., Ingersoll, E.H. et al. Analyse der Farbstoffe. Fresenius, Zeitschrift f. anal. Chemie 77, 305–308 (1929). https://doi.org/10.1007/BF01362482
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DOI: https://doi.org/10.1007/BF01362482