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\bibitem{Shpanchenko_etal2003} {\textquotedblleft}\textit{Synthesis, structure and magnetic properties of the new mixed-valence vanadate Na$_{2}$SrV$_{3}$O$_{9}$}{\textquotedblright}. Shpanchenko RV, Chernaya VV, Antipov EV, Hadermann J, Kaul EE, Geibel C, Journal of solid state chemistry \textbf{173}, 244 (2003).   http://doi.org/10.1016/S0022-4596(03)00039-2

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