Młyńska, Anna, and Krzysztof Chmielowski. “Heavy Metals Concentration in Sewage Treated at the Collective Wastewater Treatment Plant”. Journal of Water and Land Development 66, no. 66 (June 30, 2025): 19–26. Accessed October 19, 2026. https://wydawnictwo.pan.pl/index.php/jwld/article/view/5045.