A. Budput, D. Y. Yan, M. T. T. Htikea, P. Khamdahsag, and V. Tanboonchuy, “Hexadecyltrimethylammonium-modified fly-ash zeolite for sulfate removal in treated coal-fired power plant effluent”, Eng Appl Sci Res, vol. 50, no. 4, pp. 350–358, Aug. 2023.