K. S. Kozhuharova, Nikolova, A. M., Zheljazkov, V. D., and Craker, L. E.,
“Investigation on the Spermoderm of Gypsophila spp. L.”,
Journal of Herbs, Spices & Medicinal Plants, vol. 5, no. 1, pp. 85 - 92, 1997.
V. D. Zheljazkov, Terziisky, D., and Karageorgiev, S.,
“Pollen Morphology of Bulgarian Ocimum basilicum L. Populations”,
Journal of Herbs, Spices & Medicinal Plants, vol. 4, no. 3, pp. 71 - 76, 1997.