“Method for Estimation of Pre-Sowing Soil Moisture of Winter Wheat and Suitable Planting Dates”. Bulgarian Journal of Soil Science, Agrochemistry and Ecology 55, no. 2 (June 30, 2021): 47–59. Accessed February 10, 2026. https://agriacad.eu/ojs/index.php/bjssae/article/view/1618.