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\bibitem{Luhrs_etal1998} {\textquotedblleft}\textit{Crystal structure of Bi$_{6}$Sr$_{8-x}$Ca$_{3+x}$O$_{22}$(-0.5\leq x\leq1.7): a mixed valence bismuth oxide related to perovskite}{\textquotedblright}. Luhrs CC, Molins E, Van Tendeloo G, Beltran-Porter D, Fuertes A, Chemistry of materials \textbf{10}, 1875 (1998).   http://doi.org/10.1021/cm9800377

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