@article{ZVMMF_1969_9_1_a7,
     author = {Yu. N. Valitskii},
     title = {The applicability of the method of finite differences to the investigation of the spectrum of an ordinary differential operator},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {108--121},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1969_9_1_a7/}
}