Thang, C., 		Cuong, L., 		Tu, N., 		Anh, V., & 		Van, H.
2026 Oct 11.  Effect of Fuel Contents on Upconversion Emission Properties of Rare-Earth Ions Doped Hydroxyapatite/Tri-Calcium Composite Phosphors. VNU Journal of Science: Mathematics - Physics. [Online] :