RETRACTED: Influence of Ni, Cu and Ag Doping on Structural Defects and Optical Band Gap of Fe2O3 NanoparticlesS. Deepthi, K.N. Sridhar, T. Ganesh, Vishwalinga Prasad B, R. Munirathnam and H.C. ManjunathaEPJ Web Conf., 359 (2026) 01003DOI: https://doi.org/10.1051/epjconf/202635901003