[2] [2] L. B. Felsen, "Complex Rays", Philips Research Reports, Special Issue in honor of C. J. Bouwk amp 30, 169(1975)

[3] [3] L. M. Brekhovskikh, "Waves in Layered Media"Second /Edition, Academic Press, N. Y., 1980,

[4] [4] У. Z. Euan and L. B. Felsen, J. Opt. Soc. Am.A, 3(4), 566(1986)

[5] [5] J. W. Ba et al., SIAM J. Appl. Math., 24(3).396(1973)

[6] [6] L. B. Felsen aud N. Mareuvitz, "Radiation and Scattering of Wavs", PreDtiee-Hall, Euglewood, Cliffs, N. J., 1973