1. O.N. Singh, A. Lakhtakia, Electromagnetic Fields in Unconventional Materials and Structures (Wiley, 2000)
2. Z.F. Li, M. Mutlu, E. Ozbay, J. Opt. 15, 023001 (2013)
3. Review articles in Nat. Mater. 6(1) (2007)
4. C. Kallin, A.J. Berlinsky, J. Phys. Condens. Matter 21, 164210 (2009)
5. IUPAP document, Physica 146A, 1 (1987)