Grisone, Agnese, and Edmunds Teirumnieks. “AS „OLAINFARM” SEWAGE TREATMENT PLANT EFFICIENCY IMPROVEMENT”. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, no. 21 (April 19, 2017): 233–239. Accessed November 5, 2024. https://journals23.rta.lv/index.php/HET/article/view/3570.