Geodesic
The third exterior boundary value problem for a second order elliptic equation. I
Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 661-669 
I. A. Danilova. The third exterior boundary value problem for a second order elliptic equation. I. Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 661-669. http://geodesic.mathdoc.fr/item/DE_1971_7_4_a8/
@article{DE_1971_7_4_a8,
     author = {I. A. Danilova},
     title = {The third exterior boundary value problem for a second order elliptic equation. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {661--669},
     year = {1971},
     volume = {7},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_4_a8/}
}
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