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Mai, C., Sonntag, G. & Oelker, A. Kaffee, Kakao, Thee. Zeitschr. f. Untersuchung d. Nahr.-u. GenuBmittel. 11, 744–745 (1906). https://doi.org/10.1007/BF02004865
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DOI: https://doi.org/10.1007/BF02004865