1. H. Bateman:Mathematical Analysis of Electrical and Optical Wave Motion (New York, N. Y., 1955).
2. P. M. Morse andH. Feshbach:Methods of Theoretical Physics, Part II (New York, N. Y., 1953).
3. See, for instance,R. G. Newton:Scattering Theory of Waves and Particles, 2nd edition (New York, N. Y., 1982).
4. J. J. Bowman, T. B. A. Senior andP. L. E. Uslenghi:Electromagnetic and Acoustic Scattering by Simple Shapes (Amsterdam, 1969).
5. R. H. T. Bates:J. Phys. A,8, L80 (1975).