College of Agricultural Sciences

V. D. Zheljazkov, Yankuloff, Y., Raev, R. Tsevtkov, Stanev, S., Margina, A., and Kovatcheva, N., “Achievements in breeding on medicinal and aromatic plants in Bulgaria”, in Proceedings of the International Symposium: Breeding Research in Aromatic and Medicinal Plants, 1996.

V. D. Zheljazkov, Kovatcheva, N., Stanev, S., and Zheljazkova, E., “Effect of heavy metal polluted soils on some qualitative and quantitative characters of mint and cornmint”, Essential Oils: Basic and Applied Research, 1997.

A. Dobreva, Kovatcheva, N., Astatkie, T., and Zheljazkov, V. D., “Improvement of essential oil yield of oil-bearing (Rosa damascena Mill.) due to surfactant and maceration”, Industrial Crops and Products, vol. 34, no. 3, pp. 1649 - 1651, 2011.

N. Kovatcheva, Nedkov, N. K., and Zheljazkov, V. D., “Study on the Oil-bearing Rose Collection at the Research Institute for Roses, Aromatic and Medicinal Plants in Bulgaria.”, 2005.