Geodesic
Electromagnetic field in a neighborhood of a focus
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 8, Tome 62 (1976), pp. 126-136

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The hf wave field near a focus in an inhomogeneous medium is described by a recurrent system of equations the solutions of which are matched with various incoming and corresponding outgoing waves. In particular, a homocentric diaphragm ray solution is considered. 
@article{ZNSL_1976_62_a10,
     author = {A. P. Kiselev},
     title = {Electromagnetic field in a neighborhood of a focus},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {126--136},
     publisher = {mathdoc},
     volume = {62},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a10/}
}
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A. P. Kiselev. Electromagnetic field in a neighborhood of a focus. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 8, Tome 62 (1976), pp. 126-136. http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a10/