SITORUS, J.; SILITONGA, D.; KOLALA, P.; AFISNA, L.; ALFIAN, D. Experimental Study Of Wear Testing Of ASTM 440C Steel On A Ball-On-Disc Tribometer Using Variations Of Lubricants. Jurnal Vokasi Mekanika (VoMek), v. 7, n. 4, p. 462-470, 4 nov. 2025.