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\bibitem{Abakumov_etal2009} {\textquotedblleft}\textit{Original close-packed structure and magnetic properties of the Pb$_{4}$Mn$_{9}$O$_{20}$ manganite}{\textquotedblright}. Abakumov AM, Hadermann J, Tsirlin AA, Tan H, Verbeeck J, Zhang H, Dikarev EV, Shpanchenko RV, Antipov EV, Journal of solid state chemistry \textbf{182}, 2231 (2009).   http://doi.org/10.1016/j.jssc.2009.06.003

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