M. K. Gora, A. . Kumar, B. L. Choudhary, S. N. Dolia, S. Kumar, and R. K. Singhal, “Electronic, structural and optical properties of Gd-doped ZnO powder synthesized by solid-state reaction method”, Bangladesh J. Sci. Ind. Res., vol. 58, no. 1, pp. 53–64, Mar. 2023.