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\bibitem{Pardo_etal2004} {\textquotedblleft}\textit{Epitaxial Sr$_{4}$Fe$_{6}$O$_{13\pm\delta}$ films obtained by pulsed laser deposition}{\textquotedblright}. Pardo JA, Santiso J, Solis C, Garcia G, Figueras A, Rossell MD, Van Tendeloo G, Journal of crystal growth \textbf{262}, 334 (2004).   http://doi.org/10.1016/j.jcrysgro.2003.10.037

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