The point-source of electromagnetic waves in the case of nonhomogeneous media (high-frequency ansatz and dual to him singular solution)
V. M. Babich

This publication is cited in the following articles:

1. S. T. Gataullin, T. M. Gataullin, “To the Problem of a Point Source in an Inhomogeneous Medium”, Math. Notes, 114:6 (2023), 1212–1216        
2. Jianliang Qian, Jian Song, Wangtao Lu, Robert Burridge, “Hadamard–Babich Ansatz for Point-Source Elastic Wave Equations in Variable Media at High Frequencies”, Multiscale Model. Simul., 19:1 (2021), 46