Phanphet S, Bangphan S, Suttipong R, Osataporn P, Wangmai A, Karnjanaaprichat T. Applying Grey Relational Analysis in the Production of Herbal Foot Soak. IENJ [internet]. 2025 Jun. 30 [cited 2026 Sep. 11];11(1):93-101. available from: https://ph02.tci-thaijo.org/index.php/ienj/article/view/258972