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van Eck, J.J., Grimme, C., Großfeld, J. et al. Kaffee, Kakao, Tee. Zeitschr. f. Untersuchung d. Nahr.-u. Genußmittel 50, 436–438 (1925). https://doi.org/10.1007/BF02133509
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DOI: https://doi.org/10.1007/BF02133509