1. D. S.Jones,The Theory of Electromagnetism, Pergamon Press, 1964.
2. C. H. Wilcox,The Domain of Dependence Inequality for Symmetric Hyperbolic Systems, Bull. Amer. Math. Soc.,70 (1964), pp. 149–154.
3. C. H. Wilcox,The Steady-state Diffraction of Electromagnetic Radiation by an Obstacle in an Inhomogeneous Anisotropic Conducting Medium, Arch. Rat. Mech. Analysis.14 (1963), pp. 326–336.
4. F. E. Borgnis -C. H. Papas,Electromagnetic Waveguides and Resonator, In Encyclopedia of Physics, vol. XVI, pp. 285–422, edited byS. Flügge, Berlin-Göttingen-Heidelberg Springer Verlag, 1958.
5. S. I. Schelkunoff,Electromagnetic Waves, D. Van Nostrand Company, Inc., New York, 1943.