D. C. Vier

Low frequency lumped element-based negative index metamaterial

Richard W. Ziolkowski, Steven A. Cummer, Bogdan Ioan Popa, 2007 .

Experimental characterization of magnetic surface plasmons on metamaterials with negative permeability

David R. Smith, Jonah N. Gollub, Jack J. Mock, 2005 .

Impact of inherent periodic structure on effective medium description of left-handed and related metamaterials

D. R. Smith, E. N. Economou, D. Smith, 2004, cond-mat/0411590.

Lumped element-based, highly sub-wavelength, negative index metamaterials at UHF frequencies

Richard W. Ziolkowski, Steven A. Cummer, Bogdan Ioan Popa, 2008 .