RETRACTED: Quantitative Assessment of Band Gap Reduction with Respect to Molar Content and Crystallinity in CeO2 NanoparticlesMuralidhara K, H.C. Manjunatha, L. Seenappa and R. MunirathnamEPJ Web Conf., 359 (2026) 01012DOI: https://doi.org/10.1051/epjconf/202635901012