Gasni, Dedison, et al. “Design and Testing of Twin-Disk Friction Torque Test Rig Using Quality Function Deployment and Function Analysis Methods Approach”. METAL: Jurnal Sistem Mekanik Dan Termal, vol. 10, no. 1, May 2026, pp. 16-27, doi:10.25077/metal.10.1.16-27.2026.