Geodesic
On the asymptotic behavior of the spectral characteristics of exterior problems for the Schr\"odinger operator
Izvestiya. Mathematics , Tome 9 (1975) no. 1, pp. 139-223

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The Green's function $G(x,y;\lambda)$, $x,y\in\Omega$, $\lambda>0$, of the Schrödinger equation $-\Delta_xG+v(x)G-\lambda G=\delta(x-y)$ satisfying a radiation condition at infinity is considered in the exterior $\Omega$ of a convex smooth closed hypersurface $\Gamma$ in $R^m$. The potential is assumed to be a smooth function with compact support. Asymptotic formulas for $\lambda\to\infty$that are uniform in $x$ and $y$ are obtained. Bibliography: 17 items. 
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     author = {V. S. Buslaev},
     title = {On the asymptotic behavior of the spectral characteristics of exterior problems for the {Schr\"odinger} operator},
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V. S. Buslaev. On the asymptotic behavior of the spectral characteristics of exterior problems for the Schr\"odinger operator. Izvestiya. Mathematics , Tome 9 (1975) no. 1, pp. 139-223. http://geodesic.mathdoc.fr/item/IM2_1975_9_1_a6/