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1992
I. Zhalnov and Zheljazkov, V. D., Competitive intraspecific relations on Sorghum halepense (L.) Pers. , Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 37, pp. 113-118, 1992.
L. Zhang, Strik, B. C., and Martin, L. W., Date of renovation affects fall and summer fruiting of June-bearing strawberry, Adv. Straw. Res., vol. 11, pp. 47-50, 1992.
V. Topalov and Zheljazkov, V. D., Effect of mechanical and chemical weed control on growth, development and productivity of mentha for planting material, in Zeszyty Naukowe Wyzszej Szkoly Rolniczo-Pedagogicznej w Siedlcach. Seria-Rolnictwo (Poland), 1992.
1991
I. Dimitrov, Terziev, Z., Zheljazkov, V. D., and Janchev, I., Effect of fertilization and planting density on the productivity of maize hybrids grown under water stress. , Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 67-71, 1991.
V. Topalov and Zheljazkov, V. D., Effect of harvesting stages on the yield of fresh material, essential oil, and planting material from Mentha piperita Huds. and Mentha arvensis L, Herba Hungarica, 1991.
V. Topalov and Zheljazkov, V. D., Effect of harvesting stages on the yields of fresh material, essential oil, and planting material from M. piperita Huds and M. arvensis , L. Herba Hungarica, vol. 30, pp. 60-67, 1991.
V. D. Zheljazkov and Zhalnov, I., The effect of the method of propagation and the planting density of Mentha upon the removal of nitrogen, phosphorus, and potassium with the planting material, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 33-41, 1991.
V. D. Zheljazkov and Zhalnov, I., The effect of the method of propagation and the planting density of Mentha upon the removal of nitrogen, phosphorus, and potassium with the planting material, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 33-41, 1991.
V. D. Zheljazkov and Topalov, V., The effect of the method of propagation and the planting density on the essential oil chemical composition in Mentha piperita Huds. and Mentha arvensis L. , Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 25-31, 1991.
I. Dimitrov, Zheljazkov, V. D., Janchev, I., and Terziev, Z., Photosynthetic productivity in a ribbon sowing of maize and soybean, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 36, pp. 73-79, 1991.
V. D. Zheljazkov and Zhalnov, I., Studies on the effect of different methods of weed control in Mentha piperita Huds. and Mentha arvensis L, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 12-19, 1991.
V. D. Zheljazkov and Zhalnov, I., Studies on the effect of different methods of weed control in Mentha piperita Huds. and Mentha arvensis L, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 12-19, 1991.
V. D. Zheljazkov and Topalov, V., . Studies on the effect of harvesting stages and the methods of weed control on the removal of nutrient elements through Mentha rhizomes from nursery plantings, Higher Institute of Agriculture – Plovdiv, Scientific Works, vol. 4, pp. 43-48, 1991.
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 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.
1989
V. Topalov and Zheljazkov, V. D., Method of reproducing and planting thickness of mint designed for planting stock, Rastenidavadni Nauki (Bulgarian Plant Sciences), vol. 1, pp. 35-39, 1989.

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