@article{SM_1972_18_2_a5,
     author = {G. V. Rozenblum},
     title = {On~the eigenvalues of the first boundary value problem in unbounded domains},
     journal = {Sbornik. Mathematics},
     pages = {235--248},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_2_a5/}
}