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\bibitem{Abakumov_etal1996} {\textquotedblleft}\textit{The crystal structure of Ba$_{8}$Ta$_{6}$NiO$_{24}$: cation ordering in hexagonal perovskites}{\textquotedblright}. Abakumov AM, Van Tendeloo G, Scheglov AA, Shpanchenko RV, Antipov EV, Journal of solid state chemistry \textbf{125}, 102 (1996).   http://doi.org/10.1006/jssc.1996.0270

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