Iskandar, Sony, Nora Azmi, and Rahmi Maulidya. “Quality Circle Implementation to Reduce Defects in Cast Steel Products in the Heavy Equipment Industry”. Operations Excellence: Journal of Applied Industrial Engineering 15, no. 3 (May 5, 2024): 285–292. Accessed June 5, 2026. https://publikasi.mercubuana.ac.id/index.php/oe/article/view/21037.