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\bibitem{Hao_etal2009} {\textquotedblleft}\textit{Shallow donor states near a semiconductor-insulator-metal interface}{\textquotedblright}. Hao YL, Djotyan AP, Avetisyan AA, Peeters FM, Physical review : B : solid state \textbf{80}, 035329 (2009).   http://doi.org/10.1103/PhysRevB.80.035329

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