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\bibitem{Lepoittevin_etal2009} {\textquotedblleft}\textit{Synthesis and structural mechanisms of the 2201-type ferrites and polytypes: Fe$_{2}$(Sr$_{2-x}$A$_{x}$)FeO$_{6.5-\delta/2}$ (A = Ba, La, Tl, Pb and Bi)}{\textquotedblright}. Lepoittevin C, Malo S, Van Tendeloo G, Hervieu M, Solid state sciences \textbf{11}, 595 (2009).   http://doi.org/10.1016/j.solidstatesciences.2008.12.005

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