Qosim, Nanang, Sugeng Supriadi, Agung Shamsuddin-Saragih, and Yudan Whulanza. 2018. “Surface Treatments of Ti-Alloy Based Bone Implant Manufactured by Electrical Discharge Machining”. Ingenieria Y Universidad 22 (2). https://doi.org/10.11144/Javeriana.iyu22-2.sttb.