B.  Tisserat and Silman, R., ?Ultra-high carbon dioxide levels enhances in vitro shoot growth and morphogenesis in labiatae?, Journal of Herbs, Spices and Medicinal Plants, vol. 7, no. 2, pp. 43 - 55, 2000.

M.  Kosar, Dorman, H. J. D., Hiltunen, R., and Kos?ar, M., ?Effect of an acid treatment on the phytochemical and antioxidant characteristics of extracts from selected Lamiaceae species?, Food Chemistry, vol. 91, no. 3, pp. 525 - 533, 2005.

T.  Kulis?ic?, Dragovic?-Uzelac, V., and Milos?, M., ?Antioxidant activity of aqueous tea infusions prepared from oregano, thyme and wild thyme?, Food Technology and Biotechnology, vol. 44, no. 4, pp. 485 - 492, 2006.