Geodesic
The wave field in the focus of hyperbolic mirror
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 74-78

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The equation of caustic hyperbolic mirror is found. A local Masiov asymptotic of field in the focus is obtained. The intensity of the field is counted for certain parameters of the mirror. 
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     title = {The wave field in the focus of hyperbolic mirror},
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H. A. Asatryan; G. Kh. Grlgorlan-Khaktian; A. K. Nikoghosian. The wave field in the focus of hyperbolic mirror. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 74-78. http://geodesic.mathdoc.fr/item/UZERU_1991_2_a9/