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\bibitem{Abakumov_etal1998} {\textquotedblleft}\textit{Synthesis and structural study of hexagonal pervoskites in the Ba5>Ta4O15-MZrO3 (M=Ba, Sr) system}{\textquotedblright}. Abakumov AM, Shpanchenko RV, Antipov EV, Lebedev OI, Van Tendeloo G, Amelinckx S, Journal of solid state chemistry \textbf{141}, 492 (1998).   http://doi.org/10.1006/jssc.1998.8001

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