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\bibitem{Ovsyannikov_etal2016} {\textquotedblleft}\textit{Charge-ordering transition in iron oxide Fe4O5 involving competing dimer and trimer formation}{\textquotedblright}. Ovsyannikov SV, Bykov M, Bykova E, Kozlenko DP, Tsirlin AA, Karkin AE, Shchennikov VV, Kichanov SE, Gou H, Abakumov AM, Egoavil R, Verbeeck J, McCammon C, Dyadkin V, Chernyshov D, van Smaalen S, Dubrovinsky LS, Nature chemistry \textbf{8}, 501 (2016).   http://doi.org/10.1038/nchem.2478

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