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\bibitem{Hai_etal1996} {\textquotedblleft}\textit{Intersubband-coupling and screening effects on the electron transport in a quasi-two-dimensional δ-doped semiconductor system}{\textquotedblright}. Hai G-Q, Studart N, Peeters FM, Koenraad PM, Wolter JH, Journal of applied physics \textbf{80}, 5809 (1996).   http://doi.org/10.1063/1.363573

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