Geodesic
The point-source of electromagnetic waves in the case of nonhomogeneous media (high-frequency ansatz and dual to him singular solution)
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 48, Tome 471 (2018), pp. 7-14

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The Maxwell equations for nonhomogeneous media is considered. The formula (in the first approximation ) for non-stationary point source of waves is found. The Fourier transform by $t$ of this expression leads to short wave asymptotic formula for wave field of high frequency point source of electromagnetic oscillations. The large parameter is the frequency. 
@article{ZNSL_2018_471_a0,
     author = {V. M. Babich},
     title = {The point-source of electromagnetic waves in the case of nonhomogeneous media (high-frequency ansatz and dual to him singular solution)},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--14},
     publisher = {mathdoc},
     volume = {471},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2018_471_a0/}
}
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V. M. Babich. The point-source of electromagnetic waves in the case of nonhomogeneous media (high-frequency ansatz and dual to him singular solution). Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 48, Tome 471 (2018), pp. 7-14. http://geodesic.mathdoc.fr/item/ZNSL_2018_471_a0/