T. A. Tan, D. T. Phuong, N. T. T. Oanh, D. X. Mai, H. V. Chung, L. H. Chi, D. T. Chien and P. D. Long, Investigation of Sodium Manganese Oxide Nanowires Synthesized by Hydrothermal Method for Alkaline Ion Battery, Comm. Phys. 24 (2014) 233. DOI: https://doi.org/10.15625/0868-3166/24/3/4158.