Thai, Dang Van, Pham Van Thang, Pham Van Ben, Bui Hong Van, Tran Minh Thi, and Hoang Nam Nhat. “Influence of Polyvinyl Pyrrolidone on Absorption and Radiation Transitions of Mn\(^{2 + }\) Ions in Mn-Doped ZnS Nanoparticles”. Communications in Physics 25, no. 4 (March 9, 2016): 349. Accessed November 30, 2021. https://vjs.ac.vn/index.php/cip/article/view/5062.