1. J.B. Keller, “The Geometric Optics Theory of Diffraction,” presented at the 1953 McGill Symp. Microwave Optics, A.F. Cambridge Res. Cent., Rep. TR-59-118 (II), pp. 207–210. 1959.
2. J.B. Keller, “A Geometrical Theory of Diffraction,” in Calculus of Variations and Its Applications, L.M. Graves, Ed., New York: McGraw-Hill, 1958, pp. 27–52.
3. J.B. Keller, “Geometrical Theory of Diffraction,” J. Opt. Soc. Amer., Vol. 52, pp. 116–130, 1962.
4. R.G. Kouyoumjian, “The Geometrical Theory of Diffraction and Its Applications” in Numerical and Asymptotic Techniques in Electromagnetics, R. Mittra, Ed., New York, Springer-Verlag, 1975.
5. J.B. Keller, R.M. Lewis, B.D. Seckler, “Asymptotic Solution of Some Diffraction Problems,” Commun. Pure Appl. Math., Vol. 9, pp. 207–256, 1956.