Šnīders, Andris. “ENERGOECONOMICS OF ELECTRICAL DRIVES FOR WASTE WATER AERATION UNITS”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2001): 191–197. Accessed May 7, 2024. https://journals.ru.lv/index.php/ETR/article/view/1959.