Upītis, Andris, Ojārs Goiževskis, Miervaldis Kristapsons, and Andis Kārkliņš. “A SYSTEM OF WASTE UTILIZATION WITH PROCESSES OF BIOLOGIC AND THERMIC DESTRUCTION”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2001): 204–210. Accessed May 3, 2024. https://journals.rta.lv/index.php/ETR/article/view/1961.