1. Veselago, V. G., "The electrodynamics of substances with simultaneously negative values of ε and μ," Soviet Physics Uspekhi, Vol. 10, No. 7, 509-514, 1968.
doi:10.1070/PU1968v010n04ABEH003699
2. Shelby, R. A., D. R. Smith, and S. Schultz, "Experimental verification of a negative refractive index of refraction," Science, Vol. 292, No. 4, 77-99, 2001.
doi:10.1126/science.1058847
3. Pendry, J. B., "Negative refraction makes a perfect lens," Phys. Rev. Lett., Vol. 85, 3966-3969, 2000.
doi:10.1103/PhysRevLett.85.3966
4. Simovski, C. R. and S. He, "Frequency range and explicit expressions for negative permittivity and permeability for an isotropic medium formed by a lattice of perfectly conducting Omega-particles," Phys. Lett. A, Vol. 311, 2003.
doi:10.1016/S0375-9601(03)00494-8
5. Huangfu, J. T., L. X. Ran, H. S. Chen, et al. "Experimental confirmation of negative refractive index of a metamaterial composed of Ω-like metallic patterns," Applied Physics Letters, Vol. 84, No. 9, 1537-1539, 2004.
doi:10.1063/1.1655673
6. Nefedov, I. S. and S. A. Tretyakov, "Theoretical study of waveguiding structures containing backward-wave materials," Proc. of XXXVIIth URSI General Assembly, 17-24, 2002.
7. Alu, A. and N. Engheta, "Anomalous mode coupling in guided-wave structures containing metamaterials with negative permittivity and permeability," Proc. IEEE 2002 Nanotechnology Conference, 26-28, 2002.
8. Wu, B.-I., T. M. Grzegorczyk, Y. Zhang, and J. A. Kong, "Guided modes with imaginary tranverse wave number in a slab waveguide with negative permittivity and permeability," Journal of Applied Physics, Vol. 93, No. 11, 9386-9388, 2003.
doi:10.1063/1.1570501
9. Ilya V. S., A. A. Sukhorukov and and Yu. S. Kivshar, "Guided modes in negative-refractive-index waveguides," Physical Review E, Vol. 67, No. 5, 057602-1, 2003.
doi:10.1103/PhysRevE.67.057602
10. Collin, R. E., Field Theory of Guided Waves, 1990., 1990.
