Halicki, W., and A. Szymańczyk. “Nutrient Substances in Surface Water of Extensive Agriculture Areas”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 26, 2006): 102–107. Accessed November 27, 2024. https://journals.rta.lv/index.php/ETR/article/view/1993.