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\bibitem{Alekseeva_etal2004} {\textquotedblleft}\textit{Synthesis and crystal structure of the Sr$_{2}$MnGa(O,F)$_{6}$ oxyfluorides}{\textquotedblright}. Alekseeva AM, Abakumov AM, Rozova MG, Antipov EV, Hadermann J, Journal of solid state chemistry \textbf{177}, 731 (2004).   http://doi.org/10.1016/j.jssc.2003.09.002

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