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 
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/
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     title = {On the evolution of wavefront of a~plane wave passing through an area with heterogeneities},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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.

[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