Geodesic
On the possibility of formation of simple caustics by deformation of the ellipsoidal mirror
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1986), pp. 65-68 
H. A. Asatryan; Yu. A. Kravtsov. On the possibility of formation of simple caustics by deformation of the ellipsoidal mirror. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1986), pp. 65-68. http://geodesic.mathdoc.fr/item/UZERU_1986_3_a9/
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     title = {On the possibility of formation of simple caustics by deformation of the ellipsoidal mirror},
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     pages = {65--68},
     year = {1986},
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     url = {http://geodesic.mathdoc.fr/item/UZERU_1986_3_a9/}
}
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[2] Yu. A. Kravtsov, Yu. I. Orlov, “Kaustiki, katastrofy i volnovye polya”, Usp. mat. nauk., 141:4 (1983), 591–629 | DOI | MR

[3] M. M. Rusinov, Nesfericheskie poverkhnosti v optike, M., 1973