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\bibitem{Krekels_etal1993} {\textquotedblleft}\textit{Order and disorder in (Nd,Ce)$_{n}$O$_{2n}$Sr$_{2}$GaCu$_{2}$O$_{5}$ and YSr$_{2}$CoCu$_{2}$O$_{7}$}{\textquotedblright}. Krekels T, Milat O, Van Tendeloo G, Amelinckx S, Babu TGN, Wright AJ, Greaves C, Journal of solid state chemistry \textbf{105}, 313 (1993).   http://doi.org/10.1006/jssc.1993.1222

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