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\bibitem{Kovba_etal2010} {\textquotedblleft}\textit{The synthesis and thermodynamic properties of strontium fluoromanganite Sr$_{2.5}$Mn$_{6}$O$_{12.5-\delta}$F$_{2}$}{\textquotedblright}. Kovba ML, Skolis YY, Abakumov AM, Hadermann J, Sukhushina IS, Russian journal of physical chemistry A \textbf{84}, 2033 (2010).   http://doi.org/10.1134/S0036024410120046

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