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\bibitem{Wang_etal2004} {\textquotedblleft}\textit{Band structure of a two-dimensional electron gas in the presence of two-dimensional electric and magnetic modulations and a perpendicular magnetic field}{\textquotedblright}. Wang XF, Vasilopoulos P, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{70}, 155312 (2004).   http://doi.org/10.1103/PhysRevB.70.155312

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