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\bibitem{Hao_etal2011} {\textquotedblleft}\textit{D$^{-}$ shallow donor near a semiconductor-metal and a semiconductor-dielectric interface}{\textquotedblright}. Hao YL, Djotyan AP, Avetisyan AA, Peeters FM, Journal of physics : condensed matter \textbf{23}, 115303 (2011).   http://doi.org/10.1088/0953-8984/23/11/115303

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