@article{RM_1994_49_4_a11,
     author = {V. V. Dubrovskii},
     title = {A~remark on a~theorem of {M.} {V.~Keldysh}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {159--160},
     year = {1994},
     volume = {49},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1994_49_4_a11/}
}