Gulbis, Vilnis, and Ruslans Shmigins. “ECOLOGICAL IMPACT OF BIODIESEL USE”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 18, 2005): 243–248. Accessed May 5, 2024. https://journals.rta.lv/index.php/ETR/article/view/2129.