S. Choudhary and L. B. Felsen, "Asymptotic Theory for Inhomogeneous Waves, " IEEE Trans. Antenna Prop. AP-21, 827–842 (1973).

K. G. Budden and P. D. Terry, "Radio Ray Tracing in Complex Space, " Proc. R. Soc. Lond. A 321, 275–301 (1971).

H. L. Bertoni, L. B. Felsen, and A. Hessel, "Local Properties of Radiation in Lossy Media, " IEEE Trans. Antennas Prop. AP-19, 226–237 (1971).

D. S. Ahluwalia, R. M. Lewis, and J. Boersma, "Uniform Asymptotic Theory of Diffraction by a Plane Screen, " Siam J. Appl. Math. 16, 783–807 (1968).

(a) M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions (Dover, New York, 1964), pp. 297–298, gives the algebraic form in (7). (b) H. Jeffreys, Asymptotic Approximations (Clarendon, Oxford, 1962), p. 42, discusses the range of s over which to include the unit term in (7).

M. Abramowitz and I. A. Stegun, in Ref. 13(a), p. 257.

D. S. Ahluwalia, R. M. Lewis, and J. Boersma, "Uniform Asymptotic Theory of Diffraction by a Plane Screen, " Siam J. Appl. Math. 16, 783–807 (1968).

H. L. Bertoni, L. B. Felsen, and A. Hessel, "Local Properties of Radiation in Lossy Media, " IEEE Trans. Antennas Prop. AP-19, 226–237 (1971).

H. L. Bertoni, L. B. Felsen, and A. Green, "Shadowing of a Gaussian Beam by an Edge" (unpublished).

D. S. Ahluwalia, R. M. Lewis, and J. Boersma, "Uniform Asymptotic Theory of Diffraction by a Plane Screen, " Siam J. Appl. Math. 16, 783–807 (1968).

K. G. Budden and P. D. Terry, "Radio Ray Tracing in Complex Space, " Proc. R. Soc. Lond. A 321, 275–301 (1971).

S. Choudhary and L. B. Felsen, "Asymptotic Theory for Inhomogeneous Waves, " IEEE Trans. Antenna Prop. AP-21, 827–842 (1973).

W. Y. D. Wang and G. A. Deschamps, "Application of Complex Ray Tracing to Scattering Problems," Proc. IEEE 62, 1541–1551 (1974).

G. A. Deschamps, "Ray Techniques in Electromagnetics," Proc. IEEE 60, 1022–1035 (1972).

L. B. Felsen, "Evansecent Waves," J. Opt. Soc. Am. 66, 751–760 (1976).

S. Choudhary and L. B. Felsen, "Asymptotic Theory for Inhomogeneous Waves, " IEEE Trans. Antenna Prop. AP-21, 827–842 (1973).

H. L. Bertoni, L. B. Felsen, and A. Hessel, "Local Properties of Radiation in Lossy Media, " IEEE Trans. Antennas Prop. AP-19, 226–237 (1971).

L. B. Felsen and N. Marcuvitz, Radiation and Scattering of Waves (Prentice-Hall, Englewood Cliffs, N. J., 1973), p. 673.

H. L. Bertoni, L. B. Felsen, and A. Green, "Shadowing of a Gaussian Beam by an Edge" (unpublished).

H. L. Bertoni, L. B. Felsen, and A. Green, "Shadowing of a Gaussian Beam by an Edge" (unpublished).

H. L. Bertoni, L. B. Felsen, and A. Hessel, "Local Properties of Radiation in Lossy Media, " IEEE Trans. Antennas Prop. AP-19, 226–237 (1971).

H. Jeffreys, in Ref. 13(b), pp. 35 and 42.

H. Jeffreys, in Ref. 13(b), pp. 117–122.

R. G. Kouyoumjian and P. H. Pathak, "A Uniform Theory of Diffraction for an Edge in a Perfectly Conducting Surface," Proc. IEEE 62, 1448–1461 (1974).

^{7}Y. A. Kravtsov, "Complex Rays and Complex Caustics, "1 Bell Lab. Translation No. TR-69–109 (1969) of paper presented at Fourth All-Union Symposium on Diffraction of Waves (Kharkov, USSR, 1967).

D. S. Ahluwalia, R. M. Lewis, and J. Boersma, "Uniform Asymptotic Theory of Diffraction by a Plane Screen, " Siam J. Appl. Math. 16, 783–807 (1968).

L. B. Felsen and N. Marcuvitz, Radiation and Scattering of Waves (Prentice-Hall, Englewood Cliffs, N. J., 1973), p. 673.

R. G. Kouyoumjian and P. H. Pathak, "A Uniform Theory of Diffraction for an Edge in a Perfectly Conducting Surface," Proc. IEEE 62, 1448–1461 (1974).

(a) M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions (Dover, New York, 1964), pp. 297–298, gives the algebraic form in (7). (b) H. Jeffreys, Asymptotic Approximations (Clarendon, Oxford, 1962), p. 42, discusses the range of s over which to include the unit term in (7).

M. Abramowitz and I. A. Stegun, in Ref. 13(a), p. 257.

K. G. Budden and P. D. Terry, "Radio Ray Tracing in Complex Space, " Proc. R. Soc. Lond. A 321, 275–301 (1971).

W. Y. D. Wang and G. A. Deschamps, "Application of Complex Ray Tracing to Scattering Problems," Proc. IEEE 62, 1541–1551 (1974).

S. Choudhary and L. B. Felsen, "Asymptotic Theory for Inhomogeneous Waves, " IEEE Trans. Antenna Prop. AP-21, 827–842 (1973).

H. L. Bertoni, L. B. Felsen, and A. Hessel, "Local Properties of Radiation in Lossy Media, " IEEE Trans. Antennas Prop. AP-19, 226–237 (1971).

K. G. Budden and P. D. Terry, "Radio Ray Tracing in Complex Space, " Proc. R. Soc. Lond. A 321, 275–301 (1971).

D. S. Ahluwalia, R. M. Lewis, and J. Boersma, "Uniform Asymptotic Theory of Diffraction by a Plane Screen, " Siam J. Appl. Math. 16, 783–807 (1968).

W. Y. D. Wang and G. A. Deschamps, "Application of Complex Ray Tracing to Scattering Problems," Proc. IEEE 62, 1541–1551 (1974).

R. G. Kouyoumjian and P. H. Pathak, "A Uniform Theory of Diffraction for an Edge in a Perfectly Conducting Surface," Proc. IEEE 62, 1448–1461 (1974).

^{7}Y. A. Kravtsov, "Complex Rays and Complex Caustics, "1 Bell Lab. Translation No. TR-69–109 (1969) of paper presented at Fourth All-Union Symposium on Diffraction of Waves (Kharkov, USSR, 1967).

G. A. Deschamps, "Ray Techniques in Electromagnetics," Proc. IEEE 60, 1022–1035 (1972).

L. B. Felsen and N. Marcuvitz, Radiation and Scattering of Waves (Prentice-Hall, Englewood Cliffs, N. J., 1973), p. 673.

(a) M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions (Dover, New York, 1964), pp. 297–298, gives the algebraic form in (7). (b) H. Jeffreys, Asymptotic Approximations (Clarendon, Oxford, 1962), p. 42, discusses the range of s over which to include the unit term in (7).

H. Jeffreys, in Ref. 13(b), pp. 117–122.

M. Abramowitz and I. A. Stegun, in Ref. 13(a), p. 257.

H. Jeffreys, in Ref. 13(b), pp. 35 and 42.

H. L. Bertoni, L. B. Felsen, and A. Green, "Shadowing of a Gaussian Beam by an Edge" (unpublished).