Kweon Jang, Won. “Optical and Spectroscopic Properties of 2 % Er and 20 % Yb Co-Doped YCa4B3O10”. Asian Journal of Chemistry 23, no. 5 (January 31, 2011): 2306–2308. Accessed November 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/10322.