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\bibitem{Sankaran_etal2010} {\textquotedblleft}\textit{First-principles modeling of intrinsic and extrinsic defects in \gamma-Al$_{2}$O$_{3}$}{\textquotedblright}. Sankaran K, Pourtois G, Degraeve R, Zahid MB, Rignanese G-M, Van Houdt J, Applied physics letters \textbf{97}, 212906 (2010).   http://doi.org/10.1063/1.3507385

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