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\bibitem{Clima_etal2012} {\textquotedblleft}\textit{First-principles simulation of oxygen diffusion in HfO$_{x}$ : role in the resistive switching mechanism}{\textquotedblright}. Clima S, Chen YY, Degraeve R, Mees M, Sankaran K, Govoreanu B, Jurczak M, De Gendt S, Pourtois G, Applied physics letters \textbf{100}, 133102 (2012).   http://doi.org/10.1063/1.3697690

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