Geodesic
Approximation of solutions of elliptic problems in domains with noncompact boundaries by solutions of exterior or interior problems
Sbornik. Mathematics, Tome 53 (1986) no. 2, pp. 551-561 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let $\Omega^R$ ($R>0$) be a family of domains approximating a domain $\Omega^\infty$ as $R\to\infty$. For example, $\Omega^R$ can be a family of expanding domains whose union over all $R$ is $\Omega^\infty$, or a family of shrinking domains whose intersection is $\Omega^\infty$. Let $\mathfrak A_R$ be the operator corresponding to a formally symmetric elliptic boundary value problem in $\Omega^R$, and let $u_\varepsilon^R=(\mathfrak A_R+i\varepsilon)^{-1}f$. Conditions are determined under which $u_\varepsilon^R$ converges to a solution of the limit problem as $R\to\infty$, or as $\varepsilon\to0$ and $R\to\infty$ simultaneously. Figures: 2. Bibliography: 10 titles. 
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     title = {Approximation of solutions of elliptic problems in domains with noncompact boundaries by solutions of exterior or interior problems},
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M. Ya. Spiridonov. Approximation of solutions of elliptic problems in domains with noncompact boundaries by solutions of exterior or interior problems. Sbornik. Mathematics, Tome 53 (1986) no. 2, pp. 551-561. http://geodesic.mathdoc.fr/item/SM_1986_53_2_a15/

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