1. H. Haus, Waves and Fields in Optoelectronics (Prentice-Hall, Englewood Cliffs, 1984; Mir, Moscow, 1988).
2. G. S. Landsberg, Optics (Nauka, Moscow, 1976).
3. Handbook of Physical Quantities, Ed. by I. S. Grigoriev and E. Z. Melikhov (Énergoatomizdat, Moscow, 1991; CRC Press, Boca Raton, 1997).
4. V. P. Torchigin, Zh. Tekh. Fiz. 66(4), 128 (1996) [Tech. Phys. 41, 365 (1996)].