DOI: 10.1055/s-00000058

Planta Medica

References

Ruckert U, Likussar W, Michelitsch A.
Simultaneous determination of total hypericin and hyperforin in St. John's wort extracts by HPLC with electrochemical detection. 
Phytochem Anal 2007; 18: 204-8  

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