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Neumann, P.W., Clement, J., Dinslage, A. et al. Kaffee, Kakao, Tee. Zeitschr. f. Untersuchung d. Nahr.-u. Genußmittel. 20, 99–102 (1910). https://doi.org/10.1007/BF02025798
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DOI: https://doi.org/10.1007/BF02025798