Hiep, Dang Tan, et al. “Isothermal Models of Chromium (VI) Adsorption by Using Fe3O4 Nanoparticles: Cr(VI) Adsorption on Fe3O4 Nanoparticles”. Metallurgical and Materials Engineering, vol. 27, no. 3, July 2020, pp. 289-9, doi:10.30544/489.