@ARTICLE{
author={Glisic Sandra B,Smelcerovic Andrija A,Zuehlke Sebastian,Spiteller Michael,Skala Dejan U},
year={2008},
title={Extraction of hyperforin and adhyperforin from St. John's Wort (Hypericum perforatum L.) by supercritical carbon dioxide},
journal={JOURNAL OF SUPERCRITICAL FLUIDS},
volume={45},
number={3},
pages={332-337},
document_type={Article},
} 

@ARTICLE{
author={Spiteller Michael,Ozen Tevfik,Smelcerovic Andrija A,Zuehlke Sebastian,Mimica-Dukic Neda M},
year={2008},
title={Phenolic constituents and the in vitro antioxidant activity of the flowers of Hypericum venustum},
journal={FITOTERAPIA},
volume={79},
number={3},
pages={191-193},
document_type={Article},
}