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\bibitem{Abakumov_etal2005} {\textquotedblleft}\textit{Ca$_{6.3}$Mn$_{3}$Ga$_{4.4}$Al$_{1.3}$O$_{18}$: a novel complex oxide with 3D tetrahedral framework}{\textquotedblright}. Abakumov AM, Hadermann J, Kalyuzhnaya AS, Rozova MG, Mikheev MG, Van Tendeloo G, Antipov EV, Journal of solid state chemistry \textbf{178}, 3137 (2005).   http://doi.org/10.1016/j.jssc.2005.07.028

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