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\bibitem{Clima_etal2014} {\textquotedblleft}\textit{RRAMs based on anionic and cationic switching : a short overview}{\textquotedblright}.  Clima S, Sankaran K, Chen YY, Fantini A, Celano U, Belmonte A, Zhang L, Goux L, Govoreanu B, Degraeve R, Wouters DJ, Jurczak M, Vandervorst W, Gendt SD, Pourtois G;, Physica status solidi: rapid research letters \textbf{8}, 501 (2014).   http://doi.org/10.1002/pssr.201409054

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