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\bibitem{Peeters_etal2002} {\textquotedblleft}\textit{Density of states and Fermi level of a periodically modulated two-dimensional electron gas}{\textquotedblright}. Peeters FM, Vasilopoulos P, Shi J, Journal of physics : condensed matter \textbf{14}, 8803 (2002).   http://doi.org/10.1088/0953-8984/14/38/305

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