Pawaree, N. and Khokhajaikiat, P. (2012) “Productivity Improvement by Using Design of Experiment: Case Study of Cotton Bud Factory in Khonkaen Province”, Engineering and Applied Science Research, 36(3), pp. 241–249. available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/1766 (accessed: 31 August 2026).