A. B. E. Aichouni, 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”, Eng. Technol. Appl. Sci. Res., vol. 11, no. 1, pp. 6799–6805, Feb. 2021.