Ibrahim, Danasabe Abdullahi, et al. “Defect-Mediated Cobalt-Doped SnO₂ Nanostructures for Enhanced Visible-Light Photocatalytic Degradation”. UMYU Scientifica, vol. 5, no. 1, Mar. 2026, pp. 276-83, https://doi.org/10.56919/usci.2651.023.