Geodesic
On replacing an outer boundary problem with associated periodic problem
Matematičeskoe modelirovanie, Tome 9 (1997) no. 11, pp. 101-110.

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We put an outer boundary problem into correspondence with a periodic problem. An estimate of proximity of their solutions is obtained in arbitrary fixed bounded domain under the same boundary conditions in relation to the period. 
@article{MM_1997_9_11_a8,
     author = {M. N. Mishkov and V. S. Ryaben'kii},
     title = {On replacing an outer boundary problem with associated periodic problem},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {101--110},
     publisher = {mathdoc},
     volume = {9},
     number = {11},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1997_9_11_a8/}
}
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M. N. Mishkov; V. S. Ryaben'kii. On replacing an outer boundary problem with associated periodic problem. Matematičeskoe modelirovanie, Tome 9 (1997) no. 11, pp. 101-110. http://geodesic.mathdoc.fr/item/MM_1997_9_11_a8/