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Scheuerer, R. and Häußler, M. and Renk, Karl Friedrich and Schomburg, Ekkehard and Koschurinov, Y. and Pavelev, Dimitri and Maleev, N. and Ustinov, V. and Zhukov, A. (2003) Frequency multiplication of microwave radiation by propagating space-charge domains in a semiconductor superlattice. Applied Physics Letters 82 (17), pp. 2826-2828.