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\bibitem{Prituzhalov_etal2007} {\textquotedblleft}\textit{:Ba$_{2.1}$Bi$_{0.9}$(O, F)$_{6.8-\delta}$: a new ordered anion-excess fluorite}{\textquotedblright}. Prituzhalov VA, Abakumov AM, Ardashnikova EI, Dolgikh VA, Van Tendeloo G, Materials research bulletin \textbf{42}, 861 (2007).   http://doi.org/10.1016/j.materresbull.2006.08.023

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