“The Effect of Quartz Sand on Structural and Optical Properties of Dy3+ Doped P2O5-CaO-BaO-Gd2O3 Glasses”. Journal of the Physical Society of Indonesia, vol. 1, no. 2, Oct. 2025, pp. 136-44, https://doi.org/10.35895/jpsi.1.2.136-144.2025.