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\bibitem{Solis_etal2008} {\textquotedblleft}\textit{Unusual strain accommodation and conductivity enhancement by structure modulation variations in Sr$_{4}$Fe$_{6}$O$_{12+\delta}$ epitaxial films}{\textquotedblright}. Sol{\'\i}s C, Rossell MD, Garcia G, Van Tendeloo G, Santiso J, Advanced functional materials \textbf{18}, 785 (2008).   http://doi.org/10.1002/adfm.200701011

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