@article{SM_1973_20_4_a1,
     author = {L. Shimon},
     title = {On~the approximation of solutions of boundary value problems in domains with an unbounded boundary},
     journal = {Sbornik. Mathematics},
     pages = {506--518},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_20_4_a1/}
}