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\bibitem{Santiso_etal2005} {\textquotedblleft}\textit{Strain relaxation and oxygen superstructure modulation in epitaxial Sr$_{4}$Fe$_{6}$O$_{13\pm\delta}$ films}{\textquotedblright}. Santiso J, Pardo JA, Solis C, Garcia G, Figueras A, Rossell MD, Van Tendeloo G, Applied physics letters \textbf{86}, 132105 (2005).   http://doi.org/10.1063/1.1886264

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