Jarosiewicz, Anna. “TRANSFORMATION OF THE WATER QUALITY IN THE SŁUPIA RIVER (POLAND)”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (August 3, 2015): 64–70. Accessed April 30, 2025. https://journals.ru.lv/index.php/ETR/article/view/1024.