Geodesic
Only ellipsoids have caustics.
Mathematische Annalen, Tome 303 (1995) no. 4, pp. 185-194.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

Mots-clés : caustics of billiard tables, ellipsoids, convex caustics 
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     author = {Peter M. Gruber},
     title = {Only ellipsoids have caustics.},
     journal = {Mathematische Annalen},
     pages = {185--194},
     publisher = {mathdoc},
     volume = {303},
     number = {4},
     year = {1995},
     zbl = {0847.34052},
     url = {http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165364/}
}
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Peter M. Gruber. Only ellipsoids have caustics.. Mathematische Annalen, Tome 303 (1995) no. 4, pp. 185-194. http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165364/