1. Surface Polaritons: Electromagnetic Waves at Surfaces and Interfaces, Ed. by V. M. Agranovich and D. D. Mills (Elsevier, Amsterdam, The Netherlands, 1982; Nauka, Moscow, 1985).
2. V. I. Stroganov, Nonlinear Metallic Optics (Nauka, Novosibirsk, 1977) [in Russian].
3. W. Hubner, K. H. Bennemann, and K. Bohmer, Phys. Rev. B: Condens. Matter 50, 17597 (1994).
4. F. Kadlec, P. Kuzel, and J.-L. Coutaz, Opt. Lett. 29, 2674 (2004).
5. F. Kadlec, P. Kuzel, and J.-L. Coutaz, Opt. Lett. 30, 1402 (2005).