1. Solution of the problem of propagation of electromagnetic waves along the earth's surface by the method of the parabolic equation;Leontovich;J. Phys. (Paris),1946
2. A synopsis of the AESD workshop on acoustic modeling by non-ray tracing techniques;Tappert,1973
3. Two new asymptotic methods in the theory of wave propagation in inhomogeneous media;Kravtsov;Soc. Phys. Acoustics,1968
4. The Schrödinger Equation in classical physics;Flatte;Amer. J. Phys.,1986
5. Space-time caustics;Gorman;Int. J. Math. and Math. Sci.,1986