Pham Hung, Vuong, 		Van Huan, Pham, 		Dinh Tam, Phuong, 		Thi Ha Hanh, Nguyen, AND 		Xuan Thang, Cao.
" The Role of Cu 2+ Concentration in Luminescence Quenching of Eu 3+ / Cu 2+ Co-doped ZrO2 Nanoparticles" <em>VNU Journal of Science: Mathematics - Physics</em> [Online], Volume 35 Number 1 (26 March 2019)