Alimova Zebo Khamidullaevna, and Niyazova Gulhayo Parpiyevna. “Ways to Improve the Operational Properties of Hydraulic Oils for Agricultural Machinery”. Texas Journal of Engineering and Technology, vol. 8, May 2022, pp. 20-22, https://zienjournals.com/index.php/tjet/article/view/1719.