@article{ZVMMF_1990_30_5_a12,
     author = {V. T. Zakharchuk and N. P. Savenkova},
     title = {Localization of the spectrum of eigenvalue problems nonlinear in the spectral parameter},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {780--782},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1990_30_5_a12/}
}