@article{IVM_1963_3_a17,
     author = {V. N. Pivnenko},
     title = {Spectral theory of the operator $-\Delta u+Ku$ in an unbounded space, where $K$ is a bounded {Hermitian} operator},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {122--134},
     publisher = {mathdoc},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_3_a17/}
}