Devi, N. S., M. R. Shiekh, L. R. Singh, and A. N. Singh. “Effect of Eu<sup>3+</sup> Ion on the Optical and Photoluminescence Properties of Chemically Synthesized CaF<sub>2</Sub> Nanoparticles”. Journal of Scientific Research, vol. 16, no. 3, Sept. 2024, pp. 745-56, doi:10.3329/jsr.v16i3.72000.