Mikaskins, Jānis, and Ivars Matisovs. “REZEKNES RIVER WATER QUALITY IN REZEKNES CITY”. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, no. 20 (April 20, 2016): 307–312. Accessed May 4, 2024. https://journals.ru.lv/index.php/HET/article/view/3511.