Gołębiowski, Wojciech, Grzegorz Zając, and Artur Wolak. “Analysis of Engine Oils from Farm Tractors in the Aspect of Their Change”. Agricultural Engineering 23, no. 1 (March 1, 2019): 25-38. Accessed April 16, 2024. https://agriceng.ptir.org/index.php/AgricEng/article/view/93.