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\bibitem{Tarakina_etal2007} {\textquotedblleft}\textit{Crystal structure and magnetic properties of complex oxides Mg$_{4-x}$Ni$_{x}$O$_{9}$, 0\leq x\leq4}{\textquotedblright}. Tarakina NV, Nikulina EA, Hadermann J, Kellerman DG, Tyutunnik AP, Berger IF, Zubkov VG, Van Tendeloo G, Journal of solid state chemistry \textbf{180}, 3180 (2007).   http://doi.org/10.1016/j.jssc.2007.09.007

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