| Cakir, A., Duru, M.E., Harmandar, M., Ciriminna, R., Passannanti, S., and Piozzi, F. 1997. Comparison of the volatile oils of Hypericum scabrum L. and Hypericum perforatum L. from Turkey. Flavour Fragr. J. 12(4):285-287. |
| |
| Chialva, F., Gabri, G., Liddle, P.A.P., and Ulian, U. 1982. Qualitative evaluation of aromatic herbs by direct headspace GC analysis. Applications of the method and comparison with the traditional analysis of essential oils. J. High Resol. Chromatogr. 5(4):182-188. |
| |
| Gudžic, B., Dordevic, S., Palic, R., and Stojanovic, G. 2001. Essential oils of Hypericum olympicum L. and Hypericum perforatum L. Flavour Fragr. J. 16(3):201-203. |
| |
| Weyerstahl, P., Splittgerber, U., Marschall, H., and Kaul, V.K. 1995. Constituents of the leaf essential oil of Hypericum perforatum L. from India. Flavour Fragr. J. 10(5):365-370. |
| |
