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\bibitem{Schuddinck_etal2001} {\textquotedblleft}\textit{Structure of the hexagonal 16l perovskites Ba$_{4}$Ca$_{0.9}$Mn$_{3.1}$O$_{11.3}$ and Ba$_{4}$Ca$_{0.5}$Mn$_{3}$Cu$_{0.5}$O$_{12-\delta}$ by high-resolution electron microscopy}{\textquotedblright}. Schuddinck W, Van Tendeloo G, Hervieu M, Floros N, Raveau B, Materials research bulletin \textbf{36}, 2689 (2001).   http://doi.org/10.1016/S0025-5408(01)00744-9

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