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Röttger, H., Mai, C., Große-Bohle, H. et al. Kaffee, Kakao, Tee. Zeitschr. f. Untersuchung d. Nahr.-u. Genußmittel. 15, 701–703 (1908). https://doi.org/10.1007/BF02005090
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DOI: https://doi.org/10.1007/BF02005090