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\bibitem{Abakumov_etal1999} {\textquotedblleft}\textit{The phase transition and crystal structures of Ba$_{3}$RM$_{2}$O$_{7.5}$ complex oxides (R=rare-earth elements, M = Al,Ga)}{\textquotedblright}. Abakumov AM, Shpanchenko RV, Lebedev OI, Van Tendeloo G, Amelinckx S, Antipov EV, Acta crystallographica: section A: foundations of crystallography \textbf{55}, 828 (1999).   http://doi.org/10.1107/S0108767399002068

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