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\bibitem{Shpanchenko_etal1994} {\textquotedblleft}\textit{High resolution electron microscopic study of Ba$_{7}$Sc$_{6}$Al$_{2}$O$_{19}$ and related phases}{\textquotedblright}. Shpanchenko RV, Nistor L, Van Tendeloo G, Amelinckx S, Antipov EV, Kovba LM, Journal of solid state chemistry \textbf{113}, 193 (1994).   http://doi.org/10.1006/jssc.1994.1359

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