Ling, Chui Min, et al. “Synthesis of Niobium-Doped Silica-Titania Composites via Solid-State Method for Photocatalytic Degradation of Methylene Blue ”. Journal of Materials in Life Sciences , vol. 4, no. 2, Nov. 2025, pp. 71-80, doi:10.11113/jomalisc.v4.106.