Nguyen, Hien, Qui Thi Le, Dai Xuan Ngo, Hanh Nguyen, Chinh Dang Huynh, & Lin Viet Dao.
" Preparation and investigation of optical properties of ZnO: Co powders." <em>VNU Journal of Science: Mathematics - Physics</em> [Online], 20.3AP (2004): n. pag. Web.  5 Dec. 2024