Keowhrai K, Grisadanurak N. Proof of UNIQUAC Activity Coefficient Model for Water-Monoethanolamine System by Gibbs-Duhem Equation Department of Chemical Engineering, Faculty of Engineering, Prince of Songkla University. Eng Appl Sci Res [internet]. 2013 Feb. 28 [cited 2026 Aug. 31];30(3):247-60. available from: https://ph01.tci-thaijo.org/index.php/easr/article/view/6587