Geodesic
Singularities of the propagation of shot waves on the plane
Sbornik. Mathematics, Tome 186 (1995) no. 11, pp. 1581-1597 Cet article a éte moissonné depuis la source Math-Net.Ru

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The subject of this paper is the geometric optics of linear shot waves on the plane. We describe the transformation fronts and scattering of rays when the light hypersurface has conic singularities. They appear if the waves propagate in a non-homogeneous anisotropic medium subject to the hyperbolic variational principle. 
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     title = {Singularities of the~propagation of shot waves on the~plane},
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I. A. Bogaevsky. Singularities of the propagation of shot waves on the plane. Sbornik. Mathematics, Tome 186 (1995) no. 11, pp. 1581-1597. http://geodesic.mathdoc.fr/item/SM_1995_186_11_a1/

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