Geodesic
On the asymptotics of Green's functions for certain wave problems. II. Nonstationary case
Sbornik. Mathematics, Tome 16 (1972) no. 1, pp. 45-59 Cet article a éte moissonné depuis la source Math-Net.Ru

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Second part of the paper. The smoothness and the behavior at infinity in time of the Green's function of the wave equation for the exterior of a convex region is studied in this part. Figures: 4. Bibliography: 20 titles. 
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V. M. Babich. On the asymptotics of Green's functions for certain wave problems. II. Nonstationary case. Sbornik. Mathematics, Tome 16 (1972) no. 1, pp. 45-59. http://geodesic.mathdoc.fr/item/SM_1972_16_1_a3/

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