Phuong, Doan Thi Thuy, Nguyen Van Minh, and Chu Tien Dung. 2013. “Structural and Optical Properties of Samples SrTi\(_{1-x}\)M\(_{x}\)O\(_3\) (M = Co, Ni) Synthesized by Sol-Gel Method”. Communications in Physics 23 (3):263. https://doi.org/10.15625/0868-3166/23/3/3373.