Geodesic
Caustics of Interior Scattering
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Singularities and applications, Tome 267 (2009), pp. 7-13

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The paper is devoted to geometrical optics of short linear waves in an inhomogeneous anisotropic medium. We find some typical singularities of caustics that arise due to the so-called interior scattering of waves, the mathematical theory of which was developed by V. I. Arnold in 1988. 
@article{TM_2009_267_a0,
     author = {I. A. Bogaevsky},
     title = {Caustics of {Interior} {Scattering}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {7--13},
     publisher = {mathdoc},
     volume = {267},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2009_267_a0/}
}
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I. A. Bogaevsky. Caustics of Interior Scattering. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Singularities and applications, Tome 267 (2009), pp. 7-13. http://geodesic.mathdoc.fr/item/TM_2009_267_a0/