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\bibitem{Tsirlin_etal2010} {\textquotedblleft}\textit{Frustrated square lattice with spatial anisotropy: crystal structure and magnetic properties of PbZnVO(PO$_{4}$)$_{2}$}{\textquotedblright}. Tsirlin AA, Nath R, Abakumov AM, Shpanchenko RV, Geibel C, Rosner H, Physical review : B : condensed matter and materials physics \textbf{81}, 174424 (2010).   http://doi.org/10.1103/PhysRevB.81.174424

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