@article{ZVMMF_1961_1_5_a2,
     author = {M. K. Gavurin},
     title = {The method of false perturbations in the location of eigenvalues},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {757--770},
     publisher = {mathdoc},
     volume = {1},
     number = {5},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1961_1_5_a2/}
}