1. Drude, P.: Lehrbuch der Optik, Leipzig, S. Hirzel (1912);
2. Born, M.: Optik, J. Springer, Heidelberg (1933);
3. Fedorov, F.I.: Opt. Spectrosc. 6 49 (1959); ibid. 6 237 (1959)
4. Band, Y.B.: Light and Matter, p. 142. Wiley, New Jersey (2006)
5. Cho, K.: Electromagnetic Metamaterials: A Modern Problem of Macroscopic Electromagnetic Fiels. Sakoda, K. (ed.), Chap. 12. Springer, Berlin