Koneru, Girija Venkateswara, et al. “Luminescence Properties of Yb3+ Ho3+ Doped GdPO4 Nanocomposites Prepared by Hydrothermal Method Using PEG(6000)”. Asian Journal of Chemistry, vol. 35, no. 7, Aug. 2023, pp. 1598-02, doi:10.14233/ajchem.2023.27466.