Geodesic
Diffraction at ray field singularities
Algebra i analiz, Tome 8 (1996) no. 2, pp. 222-237 
A. Hanyga. Diffraction at ray field singularities. Algebra i analiz, Tome 8 (1996) no. 2, pp. 222-237. http://geodesic.mathdoc.fr/item/AA_1996_8_2_a12/
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     author = {A. Hanyga},
     title = {Diffraction at ray field singularities},
     journal = {Algebra i analiz},
     pages = {222--237},
     year = {1996},
     volume = {8},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_1996_8_2_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A general method for constructing canonical functions for ray field singularities involving caustics, shadow boundaries and their intersections is presented. It is shown that many time-domain canonical functions can be expressed in terms of elementary functions and elliptic integrals.