Chanthima, N., N. Kiwsakunkran, J. Kaewkhao, and N. Sangwaranatee. “Optical and Luminescence Investigation of Er3+ Doped in Na2O-Al2O3-P2O5 Glasses for Photonics Material Application”. Journal of Metals, Materials and Minerals, vol. 29, no. 2, June 2019, https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/408.