1. Veselago, V. G., "The electrodynamics of substances with simultaneously negative values of ² and μ," Sov. Phys. Usp., Vol. 10, No. 4, 509-514, Jan.–Feb. 1968.
doi:10.1070/PU1968v010n04ABEH003699
2. Pendry, J., A. Holden, W. Stewart, and I. Youngs, "Extremely low frequency plasmons in metallic mesostructures," Phys. Rev. Lett., Vol. 76, 4773-4776, June 1996.
doi:10.1103/PhysRevLett.76.4773
3. Pendry, J., A. Holden, and W. Stewart, "Magnetism from conductors and enhanced nonlinear phenomena," IEEE Trans. Microwave Theory Tech., Vol. 47, No. 18, 2075-2084, Nov. 1999.
4. Smith, D. R., W. J. Padilla, D. C. Vier, S. C. Nemat-Nasser, and S. Schultz, "Composite medium with simultaneously negative permeability and permittivity," Phys. Rev. Lett., Vol. 84, No. 18, 4184-4187, May 2000.
doi:10.1103/PhysRevLett.84.4184
5. Pendry, J. B., "Negative refraction makes a perfect lens," Phys. Rev. Lett., Vol. 85, No. 18, 3966-3969, Oct. 2000.
doi:10.1103/PhysRevLett.85.3966
6. Kong, J. A., Electromagnetic Wave Theory, EMW Publishing, Cambridge, Massachusetts, 2000.