TRANSFORMATION OF THE WATER QUALITY IN THE SŁUPIA RIVER (POLAND). ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 2, p. 64–70, 2015. DOI: 10.17770/etr2009vol2.1024. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3716.. Acesso em: 11 mar. 2026.