Ibrahim, Gusri Akhyar, et al. “Optimization of Machining Parameters on The Geometry Precision of Cortical Screw of Ti-6Al-4V ELI Using Gray Relational Analysis Method ”. International Journal on Advanced Science, Engineering and Information Technology, vol. 14, no. 2, Apr. 2024, pp. 657-64, doi:10.18517/ijaseit.14.2.19348.