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\bibitem{Hai_etal1995} {\textquotedblleft}\textit{Electron-mobility in 2 coupled delta-layers}{\textquotedblright}. Hai, Studart, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{52}, 11273 (1995).   http://doi.org/10.1103/PhysRevB.52.11273

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