Nguyen, T. H., T. D. T. Phan, N. P. L. Tran, H. V. T. Luong, and D. T. Nguyen. “Adsorption of Co(II) from the Simulated Solution by Zeolite NaX Derived from Rice Husk Ash”. CTU Journal of Innovation and Sustainable Development, vol. 15, no. 1, Mar. 2023, pp. 71-78, doi:10.22144/ctu.jen.2023.009.