Ishdorj, Dorjsuren, and Enkhbayar Gonchigdorj. “Oil Selection and Resources of Internal Combustion Engine”. Mongolian Journal of Agricultural Sciences 31, no. 3 (February 15, 2021): 166–173. Accessed February 24, 2024. https://www.mongoliajol.info/index.php/MJAS/article/view/1551.