[1]Chinh, N.T. et al. 2017. Using fly ash treated by NaOH and H2SO4 solutions for Hg2+ and Cd2+ ion adsorption. <i>Vietnam Journal of Chemistry</i>. 55, 2 (Apr. 2017), 196. DOI:https://doi.org/10.15625/2525-2321.2017-00443.