M. L.  Arrebola, Navarro, M. C., and Jime?nez, J., ?Essential Oils from Satureja obovata, Thymus serpylloides subsp. serpylloides and T. serpylloides subsp. gadorensis Micropropagated Plants?, Journal of Essential Oil Research, vol. 9, no. 5, pp. 533 - 536, 1997.