Phanphet, S., Bangphan, S., Suttipong, R., Osataporn, P., Wangmai, A. and Karnjanaaprichat, T. (2025) “Applying Grey Relational Analysis in the Production of Herbal Foot Soak”, Thai Industrial Engineering Network Journal, 11(1), pp. 93–101. available at: https://ph02.tci-thaijo.org/index.php/ienj/article/view/258972 (accessed: 13 September 2026).