@article{ZVMMF_2000_40_12_a2,
     author = {B. I. Bandyrskii and V. L. Makarov},
     title = {Sufficient conditions for the eigenvalues of the operator $-d^2/dx^2+q(x)$ under the {Ionkin{\textendash}Samarskii} conditions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1787--1800},
     year = {2000},
     volume = {40},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_12_a2/}
}