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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.
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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.
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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.
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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.
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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.
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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.