@article{ZVMMF_1982_22_4_a23,
     author = {A. B. Bakushinskii},
     title = {Principle of the residual in the case of a perturbed operator for},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {989--993},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1982_22_4_a23/}
}