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\bibitem{Bezjak_etal2010} {\textquotedblleft}\textit{The local structure and composition of Ba$_{4}$Nb$_{2}$O$_{9}$-based oxycarbonates}{\textquotedblright}. Bezjak J, Abakumov AM, Recnik A, Krzmanc MM, Jancar B, Suvorov D, Journal of solid state chemistry \textbf{183}, 1823 (2010).   http://doi.org/10.1016/j.jssc.2010.06.003

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