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\bibitem{Abakumov_etal2003} {\textquotedblleft}\textit{Ordering of tetrahedral chains in the Sr$_{2}$MnGaO$_{5}$ brownmillerite}{\textquotedblright}. Abakumov AM, Alekseeva AM, Rozova MG, Antipov EV, Lebedev OI, Van Tendeloo G, Journal of solid state chemistry \textbf{174}, 319 (2003).   http://doi.org/10.1016/S0022-4596(03)00226-3

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