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\bibitem{Dixit_etal2013} {\textquotedblleft}\textit{First-principles study of possible shallow donors in ZnAl$_{2}$O$_{4}$ spinel}{\textquotedblright}. Dixit H, Tandon N, Cottenier S, Saniz R, Lamoen D, Partoens B, Physical review : B : condensed matter and materials physics \textbf{87}, 174101 (2013).   http://doi.org/10.1103/PhysRevB.87.174101

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