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\bibitem{Nistor_etal1994} {\textquotedblleft}\textit{Defects and phase transformation in monclinic natural hollandite: Ba$_{x}$Mn$_{8}$O$_{16}$}{\textquotedblright}. Nistor LC, Van Tendeloo G, Amelinckx S, Journal of solid state chemistry \textbf{109}, 152 (1994)

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