J. A. Stratton, Electromagnetic Theory (McGraw-Hill Book Company, Inc., New York, 1941), Chapter IX.
Lord Rayleigh, The Theory of Sound (MacMillan Company, Ltd., London, 1937) Vol. II, Chapters IV and V.
H. Primakoff and J. B. Keller, J. Acous. Soc. Am. 19, 820 1947).
J. B. Keller, Reflection and Transmission of Electromagnetic Waves by Thin Curved Shells, New York University, Washington Square College Mathematics Research Group, Report No. 172–5.
R. K. Luneberg, "Mathematical theory of optics," Brown University Graduate School (Providence, 1944), notes.
J. B. Keller (Lecture notes, New York University).
C. B. Barker and H. Riblet, Reflections from Curved Surfaces M. I. T. Radiation Laboratory, Report No. 976.
J. B. Keller, Reflection of Electromagnetic Waves, New York University, Washington Square College Mathematics Research Group, Report No. 176–1.
L. P. Eisenhart, Differential Geometry (Princeton University Press, Princeton, 1940), Chapter IV.
van der Pol, and Bremmer, Phil. Mag.  24, 825 (1937), Eqs. 91–93.