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  • 1
    J. Chen et al.: “Observation of the inverse Doppler effect in negative-index materials at optical frequencies”, Nat. Photon., 5, 239, (2011).
  • 2
    V.G. Veselago, “Electrodynamics of substances with simultaneously negative values of ε and μ”, Sov. Phys. Usp., 10, 509, (1968).