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Journal Article
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, Beitrage zur Zuchtungsforschung , vol. 2, pp. 142-145, 1996.
V. D. Zheljazkov, Astatkie, T., Shiwakoti, S., Poudyal, S., Horgan, T., Kovatcheva, N., and Dobreva, A., Essential Oil Yield and Composition of Garden Sage as a Function of Different Steam Distillation Times, HortScience, vol. 49, no. 6, 2014.
A. Margina, Zheljazkov, V. D., and Kovatcheva, N., Fungus diseases on essential oil and medicinal plants., Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 395-362, 1995.
A. Dobreya, Kovatcheva, N., Astatkie, T., and Zheljazkov, V. D., Improvement of essential oil yield of oil-bearing rose (Rosa damascena Mill.) due to surfactant and maceration, Industrial Crops and Products, vol. 34, pp. 1649-1651, 2011.
V. D. Zheljazkov, Jeliazkova, E. A., Kovatcheva, N., and Dzhurmanski, A., Metal uptake by medicinal plant species grown in soils contaminated by a smelter, Environ. Ex. Bot. , vol. 64, pp. 207-216, 2008.
N. Kovatcheva, Zheljazkov, V. D., and Astatkie, T., Productivity, oil content, composition, and bioactivity of oil-bearing rose accessions, HortScience, vol. 46, pp. 710-714, 2011.
N. Kovatcheva, Zheljazkov, V. D., and Astatkie, T., Productivity, oil content, composition, and bioactivity of oil-bearing rose accessions, HortScience, vol. 46, no. 5, 2011.