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\bibitem{Reynaud_etal2014} {\textquotedblleft}\textit{Design of new electrode materials for Li-ion and Na-ion batteries from the bloedite mineral Na$_{2}$Mg(SO$_{4}$)$_{2}$\cdot4H$_{2}$O}{\textquotedblright}. Reynaud M, Rousse G, Abakumov AM, Sougrati MT, Van Tendeloo G, Chotard J-N, Tarascon J-M, Journal of materials chemistry A : materials for energy and sustainability \textbf{2}, 2671 (2014).   http://doi.org/10.1039/c3ta13648e

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