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Keller, K., Knöss, W. Warum Phytopharmaka?. Bundesgesundheitsbl - Gesundheitsforsch - Gesundheitsschutz 46, 1035 (2003). https://doi.org/10.1007/s00103-003-0750-y
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DOI: https://doi.org/10.1007/s00103-003-0750-y