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Gerhardts, R. and Weiss, Dieter and Wulf, U. (1991) Magnetoresistance oscillations in a grid potential: Indication of a Hofstadter-type energy spectrum. Physical Review B 43, pp. 5192-5195.
Gerhardts, R. and Pfannkuche, D. and Weiss, Dieter and Wulf, U. (1991) Magnetotransport in a Two-Dimensional Electron Gas Subject to a Weak Superlattice Potential. In: Landwehr, Gottfried, (ed.) High Magnetic Fields in Semiconductor Physics III. Springer Series in Solid State Sciences, 101. Springer, Berlin, 359ff. ISBN 3-540-53618-3, 0-387-53618-3.