@article{ZVMMF_1994_34_5_a9,
     author = {A. A. Abramov and L. F. Yukhno},
     title = {Determining the number of eigenvalues of a spectral problem},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {776--783},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1994_34_5_a9/}
}