Aichouni, A. B. E., H. Abdullah, and F. Ramlie. “A Scientific Approach of Using the DMAIC Methodology to Investigate the Effect of Cutting Tool Life on Product Quality and Process Economics: A Case Study of a Saudi Manufacturing Plant”. Engineering, Technology & Applied Science Research 11, no. 1 (February 6, 2021): 6799–6805. Accessed January 21, 2022. https://etasr.com/index.php/ETASR/article/view/4008.