Jearnkulprasert, Ngarmjit, Onanong Chaemlek, Nuantip Wantana, and J Kaewkhao. 2018. “Physical Optical Properties of 20CaO-(80-x)B2O3-XZnO Glass System”. Journal of Metals, Materials and Minerals 27 (2). Bangkok, Thailand. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/330.