Munasir, A. Taufiq, A. Teraningtyas, D. H. Kusumawati, and Z. A. I. Supardi. “Nanosized Fe3O4/SiO2 core-shells fabricated from natural sands, magnetic properties, and their application for dye adsorption”. Engineering and Applied Science Research, vol. 49, no. 3, Nov. 2021, pp. 340-52, https://ph01.tci-thaijo.org/index.php/easr/article/view/246565.