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\bibitem{Tsirlin_etal2011} {\textquotedblleft}\textit{Phase separation and frustrated square lattice magnetism of Na$_{1.5}$VOPO$_{4}$F$_{0.5}$}{\textquotedblright}. Tsirlin AA, Nath R, Abakumov AM, Furukawa Y, Johnston DC, Hemmida M, Krug von Nidda H-A, Loidl A, Geibel C, Rosner H, Physical review : B : condensed matter and materials physics \textbf{84}, 014429 (2011).   http://doi.org/10.1103/PhysRevB.84.014429

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