@article{SM_1983_45_4_a9,
     author = {A. L. Skubachevskii},
     title = {On the spectrum of some nonlocal elliptic boundary value problems},
     journal = {Sbornik. Mathematics},
     pages = {543--553},
     publisher = {mathdoc},
     volume = {45},
     number = {4},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_45_4_a9/}
}