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V. D. Zheljazkov, Shiwakoti, S., Astatkie, T., Salamon, I., Grul'ova, D., Mudrencekova, S., and Schlegel, V., Yield, Composition, and antioxidant capacity of ground cumin seed oil fractions obtained at different time points during the hydrodistillation, HortScience, vol. 50, pp. 1213-1217, 2015.
V. D. Zheljazkov, Cerven, V., Cantrell, C. L., Ebelhar, W., and Horgan, T., Effect of nitrogen, location, and harvesting stage on peppermint productivity, oil content, and oil composition, HortScience, vol. 44, no. 5, 2009.
V. D. Zheljazkov, Vick, B. A., Buehring, N., and Astatkie, T., Oil Content and Saturated Fatty Acids in Sunflower (Helianthus annus L.) as a Function of Planting Date, N Rate and Hybrid, Agron J, vol. 101, pp. 1003-1011, 2009.
V. D. Zheljazkov, Yankov, B., and Topalov, V., Effect of Mechanical and Chemical Weed Control on the Growth, Development and Productivity of Mentha piperita and M. arvensis var. piperascens Grown for Planting Material, Journal of Essential Oil Research, vol. 8, no. 2, pp. 171 - 176, 1996.
V. D. Zheljazkov, Cantrell, C. L., Donega, M. Augusto, Astatkie, T., and Heidel, B., Podophyllotoxin Concentration in Junipers in the Big Horn Mountains in Wyoming, HortScience, vol. 47, no. 12, 2012.
V. D. Zheljazkov and Nielsen, N. E., Growing Clary Sage (Salvia sclarea L.) in Heavy Metal Polluted Areas, Acta Hort. , vol. 426, pp. 309-328, 1996.
V. D. Zheljazkov, Astatkie, T., Horgan, T., Schlegel, V., and Simonnet, X., Distillation Time Effect on Essential Oil Yield, Composition, and Antioxidant Capacity of Sweet Sagewort, HortScience, vol. 48, pp. 1288-1292, 2013.
V. D. Zheljazkov, Pickett, K. M., Caldwell, C. D., Pincock, J. A., Roberts, J. C., and Mapplebeck, L., Cultivar and sowing date effects on seed yield and oil composition of coriander in Atlantic Canada, Industrial Crops and Products, vol. 28, no. 1, pp. 88 - 94, 2008.
V. D. Zheljazkov, Astatkie, T., Jeliazkova, E. A., and Schlegel, V., Distillation time alters essential oil yield, composition, and antioxidant activity of male Juniperus Scopulorum trees, Journal of Oleo Science, vol. 61, pp. 537-546, 2012.
V. D. Zheljazkov, Patterson, K., Parsons, K. J., and Sampson, G., Tolerance of bare-root ornamental perennials to selected herbicides, Canadian Journal of Plant Science, vol. 87, no. 2, pp. 439 - 442, 2007.
V. D. Zheljazkov, Bowes, K. M., Caldwell, C. D., Pincock, J. A., Roberts, J. C., and Mapplebeck, L., Cultivar and sowing date effects on seed yield and oil composition of coriander in Atlantic Canada, Industrial Crops and Products, vol. 28, pp. 88-94, 2008.
V. D. Zheljazkov and Nielsen, N. E., GROWING CLARY SAGE (SALVIA SCLAREA L.) IN HEAVY METAL - POLLUTED AREAS, Acta Horticulturae, no. 426, pp. 309 - 328, 1996.
V. D. Zheljazkov, Astatkie, T., and Schlegel, V., Postharvest Biology and Technology-Distillation Time Changes Oregano Essential Oil Yields and Composition but Not the Antioxidant or Antimicrobial Activities, Hortscience, vol. 47, no. 6, 2012.
V. D. Zheljazkov, Productivity and quality of coriander in heavy metal polluted areas, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 363-373, 1995.
V. D. Zheljazkov, Astatkie, T., and Hristov, A. N., Lavender and hyssop productivity, oil content, and bioactivity as a function of harvest time and drying, Industrial Crops and Products, vol. 36, pp. 222-228, 2012.
V. D. Zheljazkov and Warman, P. R., Phytoavailability and fractionation of copper, manganese, and zinc in soil following application of two composts to four crops, Environmental Pollution, vol. 131, no. 2, pp. 187 - 195, 2004.
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.
V. D. Zheljazkov, Craker, L. E., and Xing, B., Effects of Cd, Pb, and Cu on growth and essential oil contents in dill, peppermint, and basil, Environ. Ex. Bot. , vol. 58, pp. 9-16, 2006.
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.
V. D. Zheljazkov, Cantrell, C. L., Astatkie, T., and Hristov, A., Yield, Content, and Composition of Peppermint and Spearmints as a Function of Harvesting Time and Drying, Journal of Agricultural and Food Chemistry, vol. 58, no. 21, pp. 11400 - 11407, 2010.

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