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\bibitem{Kalyuzhnaya_etal2010} {\textquotedblleft}\textit{Synthesis and crystal structure of the new complex oxide Ca$_{7}$Mn$_{2.14}$Ga$_{5.86}$O$_{17.93}$}{\textquotedblright}. Kalyuzhnaya AS, Abakumov AM, Rozova MG, d{\textquoteright} Hondt H, Hadermann J, Antipov EV, Russian chemical bulletin \textbf{59}, 706 (2010).   http://doi.org/10.1007/s11172-010-0150-z

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