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\bibitem{DeSloovere_etal2018} {\textquotedblleft}\textit{Reduced Na$_{2+x}$Ti$_{4}$O$_{9}$ composite : a durable anode for sodium-ion batteries}{\textquotedblright}. De Sloovere D, Safari M, Elen K, D{\textquoteright}Haen J, Drozhzhin OA, Abakumov AM, Simenas M, Banys J, Bekaert J, Partoens B, Van Bael MK, Hardy A, Chemistry of materials \textbf{30}, 8521 (2018).   http://doi.org/10.1021/ACS.CHEMMATER.8B03301

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