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\bibitem{Panin_etal2004} {\textquotedblleft}\textit{Crystal structure, polymorphism, and properties of the new vanadyl phosphate Na$_{4}$VO(PO$_{4}$)$_{2}$}{\textquotedblright}. Panin RV, Shpanchenko RV, Mironov AV, Velikodny YA, Antipov EV, Hadermann J, Tarnopolsky VA, Yaroslavtsev AB, Kaul EE, Geibel C, Chemistry of materials \textbf{16}, 1048 (2004).   http://doi.org/10.1021/cm0351543

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