@ARTICLE{
author={Pavlovic Milica M,Tzakou Olga,Petrakis PV,Couladis M},
year={2006},
title={The essential oil of Hypericum perforatum L., Hypericum tetrapterum fries and Hypericum olympicum L. growing in Greece},
journal={FLAVOUR AND FRAGRANCE JOURNAL},
volume={21},
number={1},
pages={84-87},
document_type={Article},
} 

@ARTICLE{
author={Roussis V,Couladis Maria A,Tzakou Olga,Loukis A,Petrakis PV,Mimica-Dukic Neda M,Jancic Radisa B},
year={2000},
title={A comparative study on the needle volatile constituents of three Abies species grown in south Balkans},
journal={JOURNAL OF ESSENTIAL OIL RESEARCH},
volume={12},
number={1},
pages={41-46},
document_type={Article},
}