@article{SM_1987_57_1_a18,
     author = {A. L. Skubachevskii},
     title = {Elliptic problems with nonlocal conditions near the boundary},
     journal = {Sbornik. Mathematics},
     pages = {293--316},
     year = {1987},
     volume = {57},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_57_1_a18/}
}