Athikulrat, Kittichai, and Saranya Yindeemorh. “Application of Six Sigma to Reduce Waste from Wire Spokes Production Process: A Case Study on Motorcycle Parts Factory”. Science and Engineering Connect 43, no. 3 (September 30, 2020): 277–296. accessed July 20, 2025. https://ph04.tci-thaijo.org/index.php/SEC/article/view/10664.