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Sonntag, G., Hasterlik, A., Mai, C. et al. Kaffee, Kakao, Tee. Zeitschr. f. Untersuchung d. Nahr.-u. Genußmittel 18, 436–439 (1909). https://doi.org/10.1007/BF02009147
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DOI: https://doi.org/10.1007/BF02009147