1. J. R. Melcher,Field Coupled Surface Waves(The Massachusetts Institute of Technology Press, Cambridge, Massachusetts, 1963).
2. J. W. S. Rayleigh,The Theory of Sound(Dover Publications, Inc., New York, 1953), Vol. II.
3. P. M. Morse and H. Feshbach,Methods of Theoretical Physics(McGraw-Hill Book Company, Inc., New York, 1953).