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D. T. T. Phuong, N. V. Minh and C. T. Dung, Structural and Optical Properties of Samples SrTi\(_{1-x}\)M\(_{x}\)O\(_3\) (M = Co, Ni) Synthesized by Sol-gel Method, Comm. Phys. 23 (2013) 263. DOI: https://doi.org/10.15625/0868-3166/23/3/3373.