Chanthima, Natthakridta, Nuchjaree Kiwsakunkran, Jakrapong Kaewkhao, and Narong Sangwaranatee. 2019. “Optical and Luminescence Investigation of Er3+ Doped in Na2O-Al2O3-P2O5 Glasses for Photonics Material Application”. Journal of Metals, Materials and Minerals 29 (2). Bangkok, Thailand. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/408.