Hariningsih, Hariningsih, Sumpena Sumpena, and Heribertus Sukarjo. “The Effectivity of Used-Oil As Quenching Medium of 42-CrMo4 Steel for Automotive Materials”. Applied Research and Smart Technology (ARSTech) 1, no. 1 (June 10, 2020): 28–34. Accessed November 21, 2024. https://journals2.ums.ac.id/arstech/article/view/11.