Juostas, Antanas, and Algirdas Janulevičius. “Evaluating Working Quality of Tractors by Their Harmful Impact on the Environment”. Journal of Environmental Engineering and Landscape Management 17, no. 2 (June 30, 2009): 106-113. Accessed November 26, 2024. https://mla.vgtu.lt/index.php/JEELM/article/view/6510.