@article{DAN_1986_291_3_a8,
     author = {A. L. Skubachevskii},
     title = {Solvability of elliptic problems with nonlocal boundary conditions},
     journal = {Doklady Akademii Nauk},
     pages = {551--555},
     publisher = {mathdoc},
     volume = {291},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_291_3_a8/}
}