Freimanis, Jānis, and V. Stonkuss. “USED SMEAR OILS IN LATVIA”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2001): 24–29. Accessed November 23, 2024. https://journals.ru.lv/index.php/ETR/article/view/1927.