Dauletbekuly, O., and K. D. Baijumanov. “Methods of Increase of Wear Resistance and Resource of Operation of Soil Pumps”. International Journal of Mathematics and Physics 6, no. 1 (October 19, 2015): 4–7. Accessed May 7, 2024. https://ijmph.kaznu.kz/index.php/kaznu/article/view/109.