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\bibitem{Milat_etal1994} {\textquotedblleft}\textit{Superstructure and structural variants in Sr$_{2}$CuO$_{2}$(CO$_{3}$)}{\textquotedblright}. Milat O, Van Tendeloo G, Amelinckx S, Babu TGN, Greaves C, Journal of solid state chemistry \textbf{109}, 5 (1994).   http://doi.org/10.1006/jssc.1994.1063

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