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\bibitem{Wu_etal2018} {\textquotedblleft}\textit{Homojunction of oxygen and titanium vacancies and its interfacial n-p effect}{\textquotedblright}. Wu S-M, Liu X-L, Lian X-L, Tian G, Janiak C, Zhang Y-X, Lu Y, Yu H-Z, Hu J, Wei H, Zhao H, Chang G-G, Van Tendeloo G, Wang L-Y, Yang X-Y, Su B-L, Advanced materials \textbf{30}, 1802173 (2018).   http://doi.org/10.1002/ADMA.201802173

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