V. G. Veselago, “The Electrodynamics of Substances with Simultaneously Negative Values of ε and μ,” Soviet Physics Uspekhi, Vol. 10, No. 4, 1968, pp. 509-514. http://dx.doi.org/10.1070/PU1968v010n04ABEH003699
 E. J. B. Pendry, A. J. Holden, D. J. Robbins and W. J. Stewart, “Low Frequency Plasmons in Thin Wire Structures,” Journal of Physics: Condensed Matter, Vol. 10, No. 22, 1998, pp. 4785-4791. http://dx.doi.org/10.1088/0953-8984/10/22/007
 M. Dalarsson, Z. Jaksic and P. Tassin, “Exact Analytical Solution for Oblique Incidence on a Graded Index Interface between a Right-Handed and a Left-Handed Material,” Journal of Optoelectronics and Advanced Materials, Vol. 1, 2009, pp. 345-352.
 N. M. Litchinitser, A. I. Maimistov, I. R. Gabitov, R. Z. Sagdeev and V. M. Shalaev, “Metamaterials: Electromagnetic Enhancement at Zero-Index Transition,” Optics Letters, Vol. 33, No. 20, 2008, pp. 2350-2352. http://dx.doi.org/10.1364/OL.33.002350