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\bibitem{Rossell_etal2013} {\textquotedblleft}\textit{Direct evidence of stacking disorder in the mixed ionic-electronic conductor Sr$_{4}$Fe$_{6}$O$_{12+\delta}$}{\textquotedblright}. Rossell MD, Abakumov AM, Ramasse QM, Erni R, ACS nano \textbf{7}, 3078 (2013).   http://doi.org/10.1021/nn3058449

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