@article{DE_1998_34_4_a15,
     author = {E. V. Chernokozhin and Yu. V. Shestopalov},
     title = {On the solvability of boundary value problems for the {Helmholtz} equation in an unbounded domain with a noncompact boundary},
     journal = {Differencialʹnye uravneni\^a},
     pages = {546--553},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_4_a15/}
}