Rozpondek, Katarzyna, and Rafał Rozpondek. “Issues of Sustainable Development in the Light of a GIS-Based Assessment of the Geochemical State of the Aquatic Environment”. Problemy Ekorozwoju, vol. 12, no. 1, Jan. 2017, pp. 131-7, https://ph.pollub.pl/index.php/preko/article/view/5005.