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\bibitem{Shpanchenko_etal1995} {\textquotedblleft}\textit{Structural study of the new complex oxides Ba$_{5-y}$Sr$_{y}$R$_{2-x}$Al$_{2}$Zr$_{1+x}$O$_{13+x/2}$ (R=Gd-Lu, Y, Sc)}{\textquotedblright}. Shpanchenko RV, Abakumov AM, Antipov EV, Nistor L, Van Tendeloo G, Amelinckx S, Journal of solid state chemistry \textbf{118}, 180 (1995).   http://doi.org/10.1006/jssc.1995.1329

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