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Kofler, L., Kofler, A. Zur Beurteilung der Reinheit des 4-Sulfonamido-2,4-diaminoazobenzols (Prontosil, Rubazin). Monatshefte für Chemie 81, 321–325 (1950). https://doi.org/10.1007/BF00903032
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DOI: https://doi.org/10.1007/BF00903032