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. 2016 Apr 14;6:24437. doi: 10.1038/srep24437

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Luneburg and Maxwell lens working at the same wavenumber for the three modes ka = 1.5 which corresponds to the frequencies ωa/c_t = 0.41, 0.24 and 0.17 for the S₀, SH₀ and A₀ polarizations, respectively.