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\bibitem{Abakumov_etal2001} {\textquotedblleft}\textit{Synthesis and crystal structure of novel layered manganese oxide Ca$_{2}$MnGaO$_{5+\delta}$}{\textquotedblright}. Abakumov AM, Rozova MG, Pavlyuk BP, Lobanov MV, Antipov EV, Lebedev OI, Van Tendeloo G, Sheptyakov DV, Balagurov AM, Bour{\'e}e F, Journal of solid state chemistry \textbf{158}, 100 (2001).   http://doi.org/10.1006/jssc.2000.9105

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