“Experimental Study Of Wear Testing Of ASTM 440C Steel On A Ball-On-Disc Tribometer Using Variations Of Lubricants”. Jurnal Vokasi Mekanika 7, no. 4 (November 4, 2025): 462–470. Accessed April 17, 2026. http://vomek.ppj.unp.ac.id/index.php/vomek/article/view/896.