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- [21] Biochemical Activities of Extracts from Hypericum perforatum L. - 3rd Communication: Modulation of peroxidase activity as a simple method for standardization ARZNEIMITTEL-FORSCHUNG-DRUG RESEARCH, 1999, 49 (02): : 115 - 119
- [30] Biochemical activities of extracts from Hypericum perforatum L.: 5th Communication:: Dopamine-β-hydroxylase-product quantification by HPLC and inhibition by hypericins and flavonoids ARZNEIMITTEL-FORSCHUNG-DRUG RESEARCH, 2000, 50 (05): : 415 - 419