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Kukushkin, I. V. and Smet, J. H. and Mikhailov, Sergey A. and Kulakovskii, D. V. and Klitzing, Klaus von and Wegscheider, Werner (2003) Observation of Retardation Effects in the Spectrum of Two-Dimensional Plasmons. Physical Review Letters (PRL) 90 (15), p. 156801.