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\bibitem{Ovsyannikov_etal2014} {\textquotedblleft}\textit{A hard oxide semiconductor with a direct and narrow bandgap and switchable pn electrical conduction}{\textquotedblright}. Ovsyannikov SV, Karkin AE, Morozova NV, Shchennikov VV, Bykova E, Abakumov AM, Tsirlin AA, Glazyrin KV, Dubrovinsky L, Advanced materials \textbf{26}, 8185 (2014).   http://doi.org/10.1002/adma.201403304

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