1. Jones, D. S.,Acoustic and Electromagnetic Waves, Clarendon Press, Oxford, 1989.
2. Schelkunoff, S. A.,Electromagnetic Waves, Van Nostrand, New York, 1943.
3. Landau, L. D., &E. M. Lifshits,Electrodynamics of Continuous Media, Pergamon Press, Oxford, 1960.
4. Borgnis, F. E., &C. H. Papas,Electromagnetic waveguides and resonators, in Encyclopedia of Physics (Ed.S. Flügge), vol. XVI. Springer, Berlin, 1958.
5. Cesari, L., A boundary value problem for quasi-linear hyperbolic systems in the Schauder canonical form,Ann. Scuola Normale Pisa 1, 311–358 (1974).