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\bibitem{Drozhzhin_etal2013} {\textquotedblleft}\textit{Li-ion diffusion in Li$_{x}$Nb$_{9}$PO$_{25}$}{\textquotedblright}. Drozhzhin OA, Vorotyntsev MA, Maduar SR, Khasanova NR, Abakumov AM, Antipov EV, Electrochimica acta \textbf{89}, 262 (2013).   http://doi.org/10.1016/j.electacta.2012.11.017

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