Nampan, P., S. Theerathammakorn, and S. Teekasap. “Efficiency Improvement of Cosmetic Tube Filling Machine by Applying QC Tools”. Thai Industrial Engineering Network Journal, vol. 7, no. 1, June 2021, pp. 32-41, https://ph02.tci-thaijo.org/index.php/ienj/article/view/242056.