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\bibitem{Kopnin_etal2004} {\textquotedblleft}\textit{Synthesis, crystal structure, and magnetic properties of new layered hexagonal perovskite Ba$_{8}$Ta$_{4}$Ru$_{8/3}$Co$_{2/3}$O$_{24}$}{\textquotedblright}. Kopnin EM, Belik AA, Shpanchenko RV, Antipov EV, Izumi F, Takayama-Muromachi E, Hadermann J, Journal of solid state chemistry \textbf{177}, 3499 (2004).   http://doi.org/10.1016/j.jssc.2004.04.032

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