Nanofabricated media with negative permeability at visible frequencies - pp17 - 20
A. N. Grigorenko,
A. K. Geim,
H. F. Gleeson,
Y. Zhang,
A. A. Firsov,
I. Y. Khrushchev, J. Petrovic
doi:10.1038/nature04242
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Article originally published in Nature