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\bibitem{Malakho_etal2005} {\textquotedblleft}\textit{Layered ordering of vacancies of lead iron phosphate Pb$_{3}$Fe$_{2}$(PO$_{4}$)$_{4}$}{\textquotedblright}. Malakho AP, Morozov VA, Pokholok KV, Lazoryak BI, Van Tendeloo G, Solid state sciences \textbf{7}, 397 (2005).   http://doi.org/10.1016/j.solidstatesciences.2005.01.007

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