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\bibitem{Abakumov_etal2003} {\textquotedblleft}\textit{Synthesis and structure of Sr$_{2}$MnGaO$_{5+\delta}$ brownmillerites with variable oxygen content}{\textquotedblright}. Abakumov AM, Rozova MG, Alekseeva AM, Kovba ML, Antipov EV, Lebedev OI, Van Tendeloo G, Solid state sciences \textbf{5}, 871 (2003).   http://doi.org/10.1016/S1293-2558(03)00112-2

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