Asti Rosalia, Citra, Satrio Wicaksono, Tatacipta Dirgantara, Arif Basuki, and Ichsan Setya Putra. 2018. “Design and Fabrication of Ball Punch Deformation Test of Metallic Sheet Material”. Mesin 27 (1):1-12. https://doi.org/10.5614/MESIN.2018.27.1.1.