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\bibitem{Tso_etal1992} {\textquotedblleft}\textit{Direct Coulomb and phonon-mediated coupling between spatially separated electron gases}{\textquotedblright}. Tso HC, Vasilopoulos P, Peeters FM, Physical review letters \textbf{68}, 2516 (1992).   http://doi.org/10.1103/PhysRevLett.68.2516

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