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\bibitem{Tsirlin_etal2012} {\textquotedblleft}\textit{(CuCl)LaTa$_{2}$O$_{\text\{7}$\} and quantum phase transition in the (CuX)LaM$_{2}$O$_{7}$ family (X=Cl, Br, M=Nb, Ta)}{\textquotedblright}. Tsirlin AA, Abakumov AM, Ritter C, Rosner H, Physical review : B : condensed matter and materials physics \textbf{86}, 064440 (2012).   http://doi.org/10.1103/PhysRevB.86.064440

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