Effendi, M. K. ., Soepangkat, B. O. P. ., Norcahyo, R. ., Suhardjono, & Sampurno. (2021). Cutting Force and Surface Roughness Optimizations in End Milling of GFRP Composites Utilizing BPNN-Firefly Method. International Journal of Integrated Engineering, 13(7), 297-306. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/7924