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\bibitem{Vasilopoulos+Peeters1991} {\textquotedblleft}\textit{Quantum magnetotransport of a 2-dimensional electron-gas subject to periodic electric or magnetic modulations}{\textquotedblright}. Vasilopoulos, Peeters FM, Physica scripta : supplements
T2 -- 11TH GENERAL CONF OF THE CONDENSED MATTER DIVISION OF THE EUROPEAN, PHYSICAL SOC, APR 08-11, 1991, EXETER, ENGLAND \textbf{T39}, 177 (1991).   http://doi.org/10.1088/0031-8949/1991/T39/027

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