Geodesic
Space-time caustic of wave field in anisotropic media
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 5-12 Cet article a éte moissonné depuis la source Math-Net.Ru

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We examine the smooth caustic of space-time rays in an anisotropic medium, assuming first-order tangency of the rays to the caustic. An analytical expression of the wave field near the caustic is derived. 
@article{ZNSL_1985_148_a0,
     author = {V. D. Azhotkin},
     title = {Space-time caustic of wave field in anisotropic media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--12},
     year = {1985},
     volume = {148},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a0/}
}
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V. D. Azhotkin. Space-time caustic of wave field in anisotropic media. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 5-12. http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a0/