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\bibitem{Clima_etal2014} {\textquotedblleft}\textit{Identification of the ferroelectric switching process and dopant-dependent switching properties in orthorhombic HfO$_{2}$ : a first principles insight}{\textquotedblright}. Clima S, Wouters DJ, Adelmann C, Schenk T, Schroeder U, Jurczak M, Pourtois G, Applied physics letters \textbf{104}, 092906 (2014).   http://doi.org/10.1063/1.4867975

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