Geodesic
On the evolution of wavefront of a~plane wave passing through an area with heterogeneities
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 15 (2012) no. 4, pp. 387-392.

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A two-dimensional eikonal equation with the right-hand side tending to unity as the distance from the origin increases is considered. Formulas describing a wavefront in such a medium have been obtained. 
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E. D. Moskalensky. On the evolution of wavefront of a~plane wave passing through an area with heterogeneities. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 15 (2012) no. 4, pp. 387-392. http://geodesic.mathdoc.fr/item/SJVM_2012_15_4_a3/

[1] Moskalenskii E. D., “O nakhozhdenii tochnykh reshenii dvumernogo uravneniya eikonala”, Sib. zhurn. vychisl. matematiki (RAN. Sib. otd-nie, Novosibirsk), 12:2 (2009), 201–209

[2] Fikhtengolts G. M., Kurs differentsialnogo i integralnogo ischisleniya, Nauka, M., 1969