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\bibitem{Rossell_etal2005} {\textquotedblleft}\textit{Transmission electron microscopic study of the defect structure in Sr$_{4}$Fe$_{6}$O$_{12+\delta}$ compounds with variable oxygen content}{\textquotedblright}. Rossell MD, Abakumov AM, Van Tendeloo G, Lomakov MV, Istomin SY, Antipov EV, Chemistry and materials \textbf{17}, 4717 (2005).   http://doi.org/10.1021/cm050777x

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