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\bibitem{Chen_etal2015} {\textquotedblleft}\textit{Extreme mobility enhancement of two-dimensional electron gases at oxide interfaces by charge-transfer-induced modulation doping}{\textquotedblright}. Chen YZ, Trier F, Wijnands T, Green RJ, Gauquelin N, Egoavil R, Christensen DV, Koster G, Huijben M, Bovet N, Macke S, He F, Sutarto R, Andersen NH, Sulpizio JA, Honig M, Prawiroatmodjo GEDK, Jespersen TS, Linderoth S, Ilani S, Verbeeck J, Van~Tendeloo G, Rijnders G, Sawatzky GA, Pryds N, Nature materials \textbf{14}, 801 (2015).   http://doi.org/10.1038/nmat4303

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