Sung Lim, C. (2014). Synthesis and Spectroscopic Properties of Superparamagnetic Iron Oxide Nanoparticle/CaWO4:Er3+, Yb3+ Composites by Microwave-Assisted Metathetic Method. Asian Journal of Chemistry, 26(5), 1297–1300. https://doi.org/10.14233/ajchem.2014.17213