1. S. A. Afanas’ev, D. G. Sannikov, and D. I. Sementsov, Radiotekh. Elektron., 58, No. 1, 5–15 (2013).
2. J. Dubois, C. Aristégui, and O. Poncelot, J. Appl. Phys., 115, No. 2, 024902-1–024902-7 (2014).
3. V. G. Veselago, Fiz. Tverd. Tela, 8, No. 12, 3571–3573 (1966).
4. F. I. Fёdorov, Optics of Anisotropic Media [in Russian], Publishing House of the Academy of Sciences of the Belorussian SSR, Minsk (1958).
5. V. G. Veselago, Acta Phys. Polon. A, 112, No. 5, 777–781 (2007).