T. A. Ta, L. D. Pham, H. S. Nguyen, C. V. Hoang, C. H. Le, C. T. Dang, H. T. T. Nguyen and N. V. Nguyen, Electrochemical Performance of \(\text{Na}_{0.44}\text{MnO}_{2}\) Synthesized by Hydrothermal Method Using as a Cathode Material for Sodium Ion Batteries, Comm. Phys. 27 (2017) 143. DOI: https://doi.org/10.15625/0868-3166/27/2/9631.