G. V. Koneru, S. Bandi, and V. N. K. Putta, “Luminescence Properties of Yb3+/Ho3+ doped GdPO4 Nanocomposites Prepared by Hydrothermal Method using PEG(6000)”, ajc, vol. 35, no. 7, pp. 1598–1602, Aug. 2023.