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\bibitem{Li_etal2009} {\textquotedblleft}\textit{Dielectric mismatch effect on coupled impurity states in a freestanding nanowire}{\textquotedblright}. Li B, Partoens B, Peeters FM, Magnus W, Microelectronics journal \textbf{40}, 446 (2009).   http://doi.org/10.1016/j.mejo.2008.06.028

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