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S. Stanev and Zheljazkov, V. D., Study on the synthesis of essential oil and free menthol in perspective for breeding Bulgarian cultivars, populations, and clones peppermint, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 15, pp. 17-22, 1995.
A. Dzhurmanski, Varbanova, K., and Zheljazkov, V. D., Study on the Seed Progeny of Echinacea purpurea Mench., HortScience, vol. 41, no. 4, 2006.
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.
V. D. Zheljazkov and Zhalnov, I., Study on the impact of different means for weed control in Mentha piperita Huds. and Mentha arvensis L., Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 51-57, 1991.
V. D. Zheljazkov and Fair, P., Study on the effect of highly heavy metal polluted soils on metal uptake and distribution in plants from genera Artemisia, Draccocephalum, Inula, Ruta, and Symphytum, Acta Hort. , vol. 426, pp. 397-417, 1996.
V. D. Zheljazkov, Horgan, T., Astatkie, T., Fratesi, D., and Mischke, C., Study on shrimp waste water and vermicompost as a nutrient source for bell peppers, HortScience, vol. 46, pp. 1493-1496, 2011.
V. D. Zheljazkov, Horgan, T., Astatkie, T., Fratesi, D., and Mischke, C., Study on shrimp waste water and vermicompost as a nutrient source for bell peppers, HortScience, vol. 46, no. 11, 2011.
N. Kovacheva, Rusanov, K., Zheljazkov, V. D., and Nedkov, N. K., Study on Morphological Characteristics and Essential Oil Constituents Bulgarian Oil-bearing Rose, HortScience, vol. 41, no. 4, 2006.
V. D. Zheljazkov, Cantrell, C. L., and Astatkie, T., Study on Japanese cornmint in Mississippi, Agron J, vol. 102, pp. 696-702, 2010.
V. D. Zheljazkov, Cantrell, C. L., and Astatkie, T., Study on Japanese Cornmint in Mississippi, Agronomy Journal, vol. 102, no. 2, p. 696, 2010.
S. Stanev and Zheljazkov, V. D., Study on Essential oil and Free Menthol Accumulation in 19 cultivars, populations, and clones of peppermint (Mentha X piperita). , Acta Hort. , vol. 629, pp. 149-152, 2004.
S. Stanev and Zheljazkov, V. D., STUDY ON ESSENTIAL OIL AND FREE MENTHOL ACCUMULATION IN 19 CULTIVARS, POPULATIONS, AND CLONES OF PEPPERMINT (MENTHA X PIPERITA), Acta Horticulturae, no. 629, pp. 149 - 152, 2004.
A. Margina and Zheljazkov, V. D., Study on economically important diseases in valerian, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 273-277, 1995.
V. D. Zheljazkov and Fair, P., STUDY OF THE EFFECT OF HIGHLY HEAVY METAL POLLUTED SOILS ON METAL UPTAKE AND DISTRIBUTION IN PLANTS FROM GENERA ARTEMISIA, DRACCOCEPHALUM, INULA, RUTA, AND SYMPHYTUM, Acta Horticulturae, no. 426, pp. 397 - 418, 1996.
V. D. Zheljazkov, Faire, P., and Craker, L. E., Study of the effect of highly heavy metal polluted on metal uptake and distribution in plants from genera Artemisia, Draccocphalum, Inula, Ruta and Symphtum, 1996.
A. Margina and Zheljazkov, V. D., STUDIES ON THE INFLUENCES OF SOME SYSTEMIC FUNGICIDES ON THE YIELDS AND QUALITY OF ESSENTIAL OIL FROM BULGARIAN OIL-BEARING ROSE, Acta Horticulturae, no. 426, pp. 355 - 364, 1996.
A. Margina and Zheljazkov, V. D., Studies on the influence of some systemic fungicides on the yields and quality of essential oil from Bulgarian oil-bearing rose, Acta Hort. , vol. 426, pp. 355-364, 1996.
V. D. Zheljazkov and Nielsen, N. E., Studies on the effect of heavy metals (Cd, Pb, Cu, Mn, Zn, and Fe) upon the growth, productivity and quality of lavender (Lavandula angustifolia Mill.) production, J. Essent. Oil Res., vol. 8, pp. 259-274, 1996.
V. D. Zheljazkov and Nielsen, N. E., Studies on the effect of heavy metals (Cd, Pb, Cu, Mn, Zn and Fe) upon the growth, productivity and quality of lavander (Lavandula vera DC) Production. , in 24th international symposium on essential oils, 1993.

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