Sung Lim, Chang. “Upconversion Properties of NaGd(WO4)2:Ho3+ Yb3+ Yellow Phosphors Synthesized by Cyclic Microwave-Modified Sol-Gel Method”. Asian Journal of Chemistry 27, no. 9 (May 26, 2015): 3281–3284. Accessed November 24, 2024. https://asianpubs.org/index.php/ajchem/article/view/27_9_30.