Widi, Restu Kartiko, et al. “Antibacterial Inactivation of Escherichia Coli After TiO2-Fe3O4-Bentonite Photocatalytic Treatment”. International Journal on Advanced Science, Engineering and Information Technology, vol. 8, no. 6, Dec. 2018, pp. 2367-73, doi:10.18517/ijaseit.8.6.3884.