Sung Lim, C. 2014. Cyclic Microwave-Modified Sol-Gel Process of NaY(WO4)2:Ho3+/Yb3+ Phosphors and Their Upconversion Photoluminescence Properties. Asian Journal of Chemistry. 26, 27 (Dec. 2014), 73–76. DOI:https://doi.org/10.14233/ajchem.2014.19016.