Sumanto, S., A. Maulana, D. Mulyadi, K. Khoirudin, S. Siswanto, S. Sukarman, A. Suhara, and S. Safril. “Enhancement Material Removal Rate Optimization of Sinker EDM Process Parameters Using a Rectangular Graphite Electrode”. 2022. Jurnal Optimasi Sistem Industri, vol. 21, no. 2, Dec. 2022, pp. 87-96, https://josi.ft.unand.ac.id/index.php/josi/article/view/618.