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\bibitem{Khasanova_etal2002} {\textquotedblleft}\textit{Synthesis, structure and properties of layered bismuthates: (Ba,K)$_{3}$Bi$_{2}$O$_{7}$ and (Ba,K)$_{2}$BiO$_{4}$}{\textquotedblright}. Khasanova NR, Kovba ML, Putilin SN, Antipov EV, Lebedev OI, Van Tendeloo G, Solid state communications \textbf{122}, 189 (2002).   http://doi.org/10.1016/S0038-1098(02)00096-0

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