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\bibitem{Gillie_etal2008} {\textquotedblleft}\textit{Oxygen vacancy ordering in the double-layered Ruddlesden-Popper cobaltite Sm$_{2}$BaCo$_{2}$O$_{7-\delta}$}{\textquotedblright}. Gillie LJ, Hadermann J, Hervieu M, Maignan A, Martin C, Chemistry of materials \textbf{20}, 6231 (2008).   http://doi.org/10.1021/cm8010138

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