@article{ZVMMF_1978_18_5_a23,
     author = {V. V. Ditkin},
     title = {Approximate calculation of the eigenvalues of a polynomial pencil of linear operators},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1302--1306},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1978_18_5_a23/}
}