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\bibitem{Hai_etal1999} {\textquotedblleft}\textit{Effects of intersubband coupling on Friedel oscillations in quasi-two-dimensional electron systems}{\textquotedblright}. Hai GQ, Peeters FM, Studart N, Marques GE, Superlattices and microstructures \textbf{25}, 185 (1999).   http://doi.org/10.1006/spmi.1998.0635

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