Fahruddin, A’rasy, and Moh. Faisal Araffi. “Leveraging Six Sigma for Enhanced Reliability in Heavy Equipment Operations”. Procedia of Engineering and Life Science 50 (March 18, 2024): 600-604. Accessed November 21, 2024. https://pels.umsida.ac.id/index.php/PELS/article/view/1543.