@article{DAN_1963_152_2_a8,
     author = {A. G. Ramm},
     title = {Spectral properties of the {Schr\"odinger} operator in domains of unbounded frontier},
     journal = {Doklady Akademii Nauk},
     pages = {282--285},
     publisher = {mathdoc},
     volume = {152},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_2_a8/}
}